qyliang/CodeNanoFix huggingface dataset:
# Buggy code:
w,h,n=map(int,input().split())
y=[0,w]
t=[0,h]
def ct(w0,h0,a0):
  if a0==1:
    v=max(w0,y[0])
    y[0]=v
  if a0==2:
    v=min(w0,y[1])
    y[1]=v
  if a0==3:
    v=max(h0,t[0])
    t[0]=v
  if a0==4:
    v=min(h0,t[1])
    t[1]=v
for i in range(n):
  w1,h1,a1=map(int,input().split())
  ct(w1,h1,a1)

print((max(y)-min(y))*(max(t)-min(t)))
  

# Fixed code:
w,h,n=map(int,input().split())
y=[0,w]
t=[0,h]
def ct(w0,h0,a0):
  if a0==1:
    v=max(w0,y[0])
    y[0]=v
  if a0==2:
    v=min(w0,y[1])
    y[1]=v
  if a0==3:
    v=max(h0,t[0])
    t[0]=v
  if a0==4:
    v=min(h0,t[1])
    t[1]=v
for i in range(n):
  w1,h1,a1=map(int,input().split())
  ct(w1,h1,a1)

print(max(0,y[1]-y[0])*max(0,t[1]-t[0]))
# Buggy code:
w,h,n = map(int, input().split())
xya = [list(map(int, input().split())) for i in range(n)]
lx = 0
rx = w
ly = 0
ry = h
for x,y,a in xya:
  if a == 1:
    lx = x
  elif a == 2:
    rx = x
  elif a == 3:
    ly = y
  else:
    ry = y
ans = w * h - max(0,rx-lx) * max(0,ry-ly)
print(ans)

# Fixed code:
w,h,n = map(int, input().split())
xya = [list(map(int, input().split())) for i in range(n)]
lx = 0
rx = w
ly = 0
ry = h
for x,y,a in xya:
  if a == 1:
    lx = max(lx,x)
  elif a == 2:
    rx = min(rx,x)
  elif a == 3:
    ly = max(ly,y)
  else:
    ry = min(ry,y)
ans = max(0,rx-lx) * max(0,ry-ly)
print(ans)
# Buggy code:
W, H, N = map(int, input().split())
left_under = (0, 0)
right_top = (W, H)
for _ in range(N):
	x, y, a = map(int, input().split())
	if a == 1:
		left_under = (x, left_under[1])
	elif a == 2:
		right_top = (x, right_top[1])
	elif a == 3:
		left_under = (left_under[0], y)
	elif a == 4:
		right_top = (right_top[1], y)

if right_top[0] - left_under[0] <= 0 or right_top[1] - left_under[1] <= 0:
	print(0)
else:
	print((right_top[0] - left_under[0])*(right_top[1] - left_under[1]))

# Fixed code:
W, H, N = map(int, input().split())
left_under = (0, 0)
right_top = (W, H)
for _ in range(N):
	x, y, a = map(int, input().split())
	if a == 1:
		left_under = (max([x, left_under[0]]), left_under[1])
	elif a == 2:
		right_top = (min([x,right_top[0]]), right_top[1])
	elif a == 3:
		left_under = (left_under[0], max([y,left_under[1]]))
	elif a == 4:
		right_top = (right_top[0], min([y,right_top[1]]))
 
if right_top[0] - left_under[0] <= 0 or right_top[1] - left_under[1] <= 0:
	print(0)
else:
	print((right_top[0] - left_under[0])*(right_top[1] - left_under[1]))
# Buggy code:
W, H, N = map(int, input().split())
x = [0] * N
y = [0] * N
a = [0] * N
for i in range(N):
    x[i], y[i], a[i] = map(int, input().split())
    
total = W*H

x_min = 0
x_max = W
y_min = 0
y_max = H
for i in range(len(a)):
    if a[i] == 1:
        if x_min < x[i]:
            x_min = x[i]
    elif a[i] == 2:
        if x_max > x[i]:
            x_max = x[i]
    elif a[i] == 3:
        if y_min < y[i]:
            y_min = y[i]
    else:
        if y_max > y[i]:
            y_max = y[i]
        
x_len = x_max-x_min
y_len = y_max-y_min

print(x_len*y_len)

# Fixed code:
W, H, N = map(int, input().split())
x = [0] * N
y = [0] * N
a = [0] * N
for i in range(N):
    x[i], y[i], a[i] = map(int, input().split())

x_min = 0
x_max = W
y_min = 0
y_max = H
for i in range(len(a)):
    if a[i] == 1:
        if x_min < x[i]:
            x_min = x[i]
    elif a[i] == 2:
        if x_max > x[i]:
            x_max = x[i]
    elif a[i] == 3:
        if y_min < y[i]:
            y_min = y[i]
    else:
        if y_max > y[i]:
            y_max = y[i]
        
x_len = x_max-x_min
y_len = y_max-y_min
result = x_len*y_len
if (x_len<0)|(y_len<0):
    result = 0

print(result)
# Buggy code:
w,h,n=map(int,input().split())
record=[]
xmin=[]
xmax=[]
ymin=[]
ymax=[]
for i in range(n):
    x,y,a=list(map(int,input().split()))
    record.append([x,y,a])
for i in range(n):
    if record[i][2] == 1:
        xmin.append(record[i][0])
    elif record[i][2] == 2:
        xmax.append(record[i][0])
    elif record[i][2] == 3:
        ymin.append(record[i][1])
    else:
        ymax.append(record[i][1])
X=min(xmax)-max(xmin)
Y=min(ymax)-max(ymin)
print(X*Y) if (X > 0 and Y > 0) else print(0) 


# Fixed code:
w,h,n=map(int,input().split())
record=[]
xmin=[]
xmax=[]
ymin=[]
ymax=[]

for i in range(n):
    x,y,a=list(map(int,input().split()))
    record.append([x,y,a])
    
for i in range(n):
    if record[i][2] == 1:
        xmin.append(record[i][0])
    elif record[i][2] == 2:
        xmax.append(record[i][0])
    elif record[i][2] == 3:
        ymin.append(record[i][1])
    else:
        ymax.append(record[i][1])

if xmax==[] and xmin==[]:
    X=w
elif xmax==[]:
    X=w-max(xmin)
elif xmin==[]:
    X=min(xmax)-0
else:
    X=min(xmax)-max(xmin)

if ymax==[] and ymin==[]:
    Y=h
elif ymax==[]:
    Y=h-max(ymin)
elif ymin==[]:
    Y=min(ymax)-0
else:
    Y=min(ymax)-max(ymin)
    
print(X*Y) if (X > 0 and Y > 0) else print(0)
# Buggy code:
n = int(input())
a = list(map(int, input().split()))
cnt = 0
for i in range(a):
    if a[a[i]] -1 == i:
        cnt +=1
print(cnt // 2)

# Fixed code:
n = int(input())
l = list(map(int, input().split()))
cnt = 0
for i in range(n):
    if i == l[l[i] - 1] - 1:
        cnt+=1
cnt //= 2
print(cnt)
# Buggy code:
N = int(input())
a = [int(i) for i in input().split()]
S = 0
for i in range(N):
  if a[a[i]] == i:
    S += 1
print(S//2)

# Fixed code:
N = int(input())
a = [int(i) for i in input().split()]
S = 0
for i in range(N):
  if a[a[i]-1] == i+1:
    S += 1
print(S//2)
# Buggy code:
n = int(input())
a = list(map(int, input().split()))
print(a)
total = 0
for i in range(n):
    if a[a[i] - 1] == i + 1:
        total += 1
print(total // 2)


# Fixed code:
n = int(input())
a = list(map(int, input().split()))

r = 0
for i in range(n):
    if i+1 == a[a[i]-1]:
        r += 1
print(r // 2)
# Buggy code:
N = int(input())
a = list(map(int, input().split()))
a = [i - 1 for i in a]

count = 0
for i in range(N):
    print(a[i])
    if i == a[a[i]]:
        count += 1
print(count // 2)


# Fixed code:
N = int(input())
a = list(map(int,input().split()))
ans = 0
for i in range(N):
    if (i+1) == a[a[i]-1]:
        ans += 1

print(ans//2)
# Buggy code:
N = int(input())
A = [int(a) - 1 for a in input().split()]
count = 0
for i in range(N):
    if i == A[A[i]]:
        count += 1

print(count)

# Fixed code:
N = int(input())
A = [int(a) - 1 for a in input().split()]
count = 0
for i in range(N):
    if i == A[A[i]]:
        count += 1

print(count // 2)
# Buggy code:
N = int(input())
a = list(map(int, input().split()))
ans = 0
for i in a:
  if a[i - 1] == i + 1:
    ans += 1
print(ans)
  

# Fixed code:
N = int(input())
a = list(map(int, input().split()))
ans = 0
for i in range(N):
    if a[i] == 0:
        continue
    if a[a[i]-1]-1 == i:
        ans += 1
        a[a[i]-1], a[i] = 0, 0
        
print(ans)
# Buggy code:
n=int(input())
a=list(map(int,input().split()))
ans=0
for i in range(n):
  if a[a[i]]==i:
    ans+=1
print(ans)

# Fixed code:
n=int(input())
a=list(map(int,input().split()))
a=[0]+a
ans=0
for i in range(1,n+1):
    if i<a[i] and a[a[i]]==i:
        ans+=1
print(ans)
# Buggy code:
N = int(input())
A = map(int, input().split())

pairs = []

for i in A:
    if A[A[i] - 1] = i + 1:
        pairs.append(1)

print(len(pairs) // 2)

# Fixed code:
N = int(input())
A = list(map(int, input().split()))

pairs = []

for i in range(len(A)):
    if A[A[i] - 1] == i + 1:
        pairs.append(1)

print(len(pairs) // 2)
# Buggy code:
N = int(input())
A = list(map(lambda x:int(x)-1,input().split()))
print(A)
ans = 0
for i in range(N):
    if A[A[i]] == i: ans += 1
print(ans//2)

# Fixed code:
N = int(input())
A = list(map(lambda x: int(x)-1, input().split()))

ans = 0
for i in range(N):
    if A[A[i]] == i:
        ans += 1
print(ans // 2)
# Buggy code:
n=int(input())
a=list(map(int,input().split()))
ans=0
for i in range(n):
  if a[a[i]-1]=i+1:ans+=1
print(ans)

# Fixed code:
n=int(input())
a=list(map(int,input().split()))
ans=0
for i in range(1,n+1):
    if a[i-1]>i and a[a[i-1]-1]==i:
        ans+=1
print(ans)
# Buggy code:
N = int(input())
rabit = [ int(v) for v in input().split(" ") ]
skip = set()
num = 0
 
for i in range(N):
  n = rabit[i]
  if i in skip:
    continue
  if rabit[n-1] == i+1:
    skip.append(n-1)
    num += 1
 
print(num)

# Fixed code:
N = int(input())
rabit = [ int(v) for v in input().split(" ") ]
skip = set()
num = 0
 
for i in range(N):
  n = rabit[i]
  if i in skip:
    continue
  if rabit[n-1] == i+1:
    skip.add(n-1)
    num += 1
 
print(num)
# Buggy code:
n = int(input())
A = list(map(int,input().split()))
ans = 0
for i in range(n):
  if i == A[i]:
    ans += 1
print(ans//2)
  

# Fixed code:
n = int(input())
A = list(map(int, input().split()))
ans = 0
for i in range(len(A)):
    if A[A[i]-1]-1 == i:
        ans += 1
print(ans // 2)
# Buggy code:
n = int(input())
l = [list(map(int, input().split())) for _ in range(n)]
l = l[0]
cnt = 0
for i in range(n):    
    if l[i]-1 > i:
        if( l[l[i]-1]-1 == i):
            cnt+=1
print(cnt)

# Fixed code:
n = int(input())
l = list(map(int, input().split())) 
cnt = 0
for i in range(n):    
    if l[i]-1 > i:
        if( l[l[i]-1]-1 == i):
            cnt+=1
print(cnt)
# Buggy code:
n = int(input())
a = list(map(int,input().split()))
c = 0
for i in range(n):
  if i == a[a[i]]:
    c += 1
print(c//2)

# Fixed code:
n = int(input())
a = [0] + list(map(int,input().split()))
c = 0
for i in range(1,n+1):
  if a[a[i]] == i:
    c += 1
print(c//2)
# Buggy code:
N=int(input())
A=list(map(int, input().split()))
ans=0
for i in range(N):
  if A[A[i-1]-1]==i+1:
    ans+=1
print(ans//2)


# Fixed code:
N = int(input())
A = list(map(int, input().split()))
ans = 0

for k in range(N):
    if A[A[k]-1] == k+1:
        ans += 1

print(ans//2)
# Buggy code:
n = int(input())
lis = list(map(int,input().split()))
ans = 0
for i in range(n):
  if lis[lis[i]] == i+1:
    ans += 1
print(ans//2)

# Fixed code:
n = int(input())
lis =[0] + list(map(int, input().split()))

cnt = 0
for i in range(1, n+1):
    if lis[lis[i]] == i:
        cnt += 1

print(cnt//2)
# Buggy code:
N = int(input())
a = list(map(int, input().split()))
ans = 0
for i in range(N):
  if a[a[i]-1] == i+1:
    ans += 1
print(ans)

# Fixed code:

N = int(input())

a = list(map(int,input().split()))

ans = 0

for i in range(N):

    a[i] -= 1

for i in range(N):

    if a[i] > i and a[a[i]] == i:
        ans += 1

print (ans)
# Buggy code:
import sys

readline = sys.stdin.readline
readlines = sys.stdin.readlines
ns = lambda: readline().rstrip() # input string
ni = lambda: int(readline().rstrip()) # input int
nm = lambda: map(int, readline().split()) # input multiple int 
nl = lambda: list(map(int, readline().split())) # input multiple int to list

n = ni()
l = nl()
ans = 0

for i, usa in enumerate(l):
    if l[usa] - 1 == i:
        ans += 1
print(ans // 2)

# Fixed code:
import sys

readline = sys.stdin.readline
readlines = sys.stdin.readlines
ns = lambda: readline().rstrip() # input string
ni = lambda: int(readline().rstrip()) # input int
nm = lambda: map(int, readline().split()) # input multiple int 
nl = lambda: list(map(int, readline().split())) # input multiple int to list

n = ni()
l = nl()
ans = 0

for i, usa in enumerate(l):
    if l[usa - 1] == i + 1:
        ans += 1
print(ans // 2)
# Buggy code:
n=int(input());a=list(map(int,input().split()));ans=0
for i in range(n):
  if i+1=a[a[i]-1]:ans+=1
print(ans)

# Fixed code:
n=int(input());a=list(map(int,input().split()));ans=0
for i in range(n):
  if i+1==a[a[i]-1]:ans+=1
print(ans//2)
# Buggy code:
# -*- coding: utf-8 -*-
# !/usr/bin/env python
# vim: set fileencoding=utf-8 :

"""
#
# Author:   Noname
# URL:      https://github.com/pettan0818
# License:  MIT License
# Created:  2016-09-28
#

# Usage
#
"""
import sys

def input_single_line():
    """Receive Inputs."""
    return input()

def input_two_line():
    """Receive Two Lined Inputs.
    Like this.

    N
    1 2 3 4 5
    """
    sys.stdin.readline()
    target = sys.stdin.readline()
    target = target.rstrip("\n")
    target = target.split(" ")

    return target


def search_lovers(target_list: list) -> None:
    """Search Simple."""
    lovers = []
    for i in target_list:
        if target_list[i-1] == i-1:
            lovers.append(i-1)

    print(len(lovers))


if __name__ == "__main__":
    import doctest
    doctest.testmod()

    target = input_two_line()



# Fixed code:
# -*- coding: utf-8 -*-
# !/usr/bin/env python
# vim: set fileencoding=utf-8 :

"""
#
# Author:   Noname
# URL:      https://github.com/pettan0818
# License:  MIT License
# Created:  2016-09-28
#

# Usage
#
"""
import sys

def input_single_line():
    """Receive Inputs."""
    return input()

def input_two_line():
    """Receive Two Lined Inputs.
    Like this.

    N
    1 2 3 4 5
    """
    sys.stdin.readline()
    target = sys.stdin.readline()
    target = target.rstrip("\n")
    target = target.split(" ")

    return target


def search_lovers(target_list: list) -> None:
    """Search Simple.
    >>> target_list = [2, 3, 1]
    >>> search_lovers(target_list)
    0
    >>> target_list = [2, 1, 4, 3]
    >>> search_lovers(target_list)
    2
    >>> target_list = [5, 5, 5, 5, 1]
    >>> search_lovers(target_list)
    1
    """
    target_list = [int(i) - 1 for i in target_list]
    lovers = []
    ans = 0
    for i, n in enumerate(target_list):
        if target_list[n] == i:
            ans = ans + 1

    print(int(ans/2))


if __name__ == "__main__":
    import doctest
    doctest.testmod()

    target = input_two_line()

    search_lovers(target)
# Buggy code:
n=input()
a=list(map(int,input().split()))
ans=0
for i in range(n):
  if a[a[i]-1]-1==i:
    ans+=1
print(ans//2)

# Fixed code:
n=int(input())
a=list(map(lambda x: int(x) - 1, input().split()))
ans = 0
for i in range(n):
    if a[a[i]] == i:
        ans += 1
print(ans//2)
# Buggy code:
N=int(input())
A=list(map(int, input().split()))
ans=0
for i in range(N):
  if A[a[i-1]-1]==i+1:
    ans+=1
print(ans//2)

# Fixed code:
N=int(input())
a=list(map(int,input().split()))

ans=0

for i in range(len(a)):
    if a[a[i]-1]==i+1:
        ans+=1

print(ans//2)
# Buggy code:
n = int(input())
a = list(map(int,input().split()))
res = 0

for i in range(n):
  sel = a[i]
  if a[sel] = i:
    res += 1
else:
  print(res/2)

# Fixed code:
n = int(input())
a = list(map(int,input().split()))
res = 0

for i in range(n):
  sel = a[i] -1
  if a[sel] == i+1:
    res += 1
else:
  print(int(res/2))
# Buggy code:
n = int(input())
a = list(map(int,input().split()))
count = 0
for i in range(n):
    if i+1 == a[i-1]:
        count+=1
print(count//2)

# Fixed code:
n = int(input())
l = list(map(int,input().split()))
count = 0
for i in range(n):
    if i+1 == l[l[i]-1]:
        count += 1
print(count//2)
# Buggy code:
N = int(input())
usa = list(map(int, input().split()))
flag = [0 for x in range(N)]
count = 0
for i, j in enumerate(usa):
    if(flag[i]):
        continue
    if(usa[j-1]-1 == i):
        count+=1
        flag[usa[j - 1]] = 1

print (count)


# Fixed code:
N = int(input())
usa = list(map(int, input().split()))
flag = [0 for x in range(N)]
count = 0
for i, ai in enumerate(usa):
    if(flag[i]):
        continue
    if(usa[ai-1]-1 == i):
        count+=1
        flag[ai - 1] = 1

print (count)
# Buggy code:
N = int(input())
A = list(map(int, input().split()))
res = 0
for i in range(N):
    if i + 1 == A[A[A[i]-1]]:
        res += 1 
print(res)

# Fixed code:
N = int(input())
A = list(map(int,input().split()))
res = 0
for i in range(N):
    if A[A[i]-1] == i+1:
        res += 1 
print(res//2)
# Buggy code:
size = int(input())
rabbits = list(map(int, input().split()))
count = 0
for i in range(size):
    if (rabbit[i] - 1) > i and (rabbits[rabbits[i]-1] -1) == i:
        count += 1
print(count)

# Fixed code:
size = int(input())
rabbits = list(map(int, input().split()))
count = 0
for i in range(size):
    if (rabbits[i] - 1) > i and (rabbits[rabbits[i]-1] - 1) == i:
        count += 1
print(count)
# Buggy code:
n=int(input())
a=list(map(int,input().split()))
cnt=0
for i in range(n):
  for j in range(n):
    if a[i]==j+1 and a[j]==i+1:
      cnt+=1
    else:
      cnt=cnt
if cnt>n:
  print(cnt-n)
else:
  print(0)
      

# Fixed code:
n=int(input())
a=list(map(int,input().split()))

cnt=0
for i in range(n):
    if a[i] >= 0 and a[a[i] - 1] == i + 1:
        cnt+=1
        a[a[i] - 1] = -1
print(cnt)
# Buggy code:
N = map(int, input().split())
a = list(map(int, input().split()))
ans = 0
for i in range(N):
    j = a[i] - 1
    if i < j and a[j] - 1 == i:
        ans += 1
print(ans)


# Fixed code:
N = int(input())
As = list(map(int, input().split()))
As = [a-1 for a in As]
r = 0
for i in range(N):
  j = As[i]
  if i < j and i == As[j]:
    r += 1
print(r)
# Buggy code:
n=int(input())
l=list(map(int,input().split()))
sum=0
for i in range(n):
  if l[l[i]]==i:
    sum+=1
print(int(sum/2))

# Fixed code:
n = int(input())
l = [0] + list(map(int, input().split()))
cnt = 0
for i in range(1, n+1):
  if l[l[i]] == i:
    cnt += 1
print(cnt//2)
# Buggy code:
def COMinit():
    fac[0] = fac[1] = 1
    finv[0] = finv[1] = 1
    inv[1] = 1
    for i in range(2,max):
        fac[i] = fac[i-1]*i%mod
        inv[i] = mod - inv[mod%i]*(mod//i)%mod
        finv[i] = finv[i-1]*inv[i]%mod

def COM(n,k):
    if n < k:
        return 0
    if n < 0 or k < 0:
        return 0
    return fac[n] * (finv[k]*finv[n-k]%mod)%mod

mod = 10**9+7

K = int(input())
S = input()
N = len(S)
max = N+K
fac = [0] * max
finv = [0] * max
inv = [0] * max
COMinit()

ans = 0
for i in range(K+1):
    x = COM(N+K-i-1,N-1)
    y = mod(26,i,mod)
    z = mod(25,K-i,mod)
    xyz = ((x*y%mod)*z)%mod
    ans = (ans+xyz)%mod
print(ans)


# Fixed code:
def COMinit():
    fac[0] = fac[1] = 1
    finv[0] = finv[1] = 1
    inv[1] = 1
    for i in range(2,max):
        fac[i] = fac[i-1]*i%mod
        inv[i] = mod - inv[mod%i]*(mod//i)%mod
        finv[i] = finv[i-1]*inv[i]%mod

def COM(n,k):
    if n < k:
        return 0
    if n < 0 or k < 0:
        return 0
    return fac[n] * (finv[k]*finv[n-k]%mod)%mod

mod = 10**9+7

K = int(input())
S = input()
N = len(S)
max = N+K
fac = [0] * max
finv = [0] * max
inv = [0] * max
COMinit()

ans = 0
for i in range(K+1):
    x = COM(N+K-i-1,N-1)
    y = pow(26,i,mod)
    z = pow(25,K-i,mod)
    xyz = ((x*y%mod)*z)%mod
    ans = (ans+xyz)%mod
print(ans)
# Buggy code:
from sys import stdin
input = stdin.readline
def nCr(n,r):
    return fact[n]*(inv[n-r]%M)*(inv[r]%M)
M = 1000000007
k = int(input())
s = len(input())
t = k+s
fact = [1]
p25 = [1]
for i in range(1,t+1):
    fact += [(fact[-1] * i)%M]
    if i<=k:
        p25  += [(p25[-1] * 25) % M]

inv = [1]*(t+1)
inv[t] = pow(fact[t], M-2, M)
for i in range(t-1, -1, -1):
    inv[i] = inv[i+1] * (i+1) % M


res = 0
for i in range(k+1):
    res+=nCr(t,t-i)*p25[i]
    res%=M
print(res)

# Fixed code:
from sys import stdin
input = stdin.readline
def nCr(n,r):
    return fact[n]*(inv[n-r]%M)*(inv[r]%M)
M = 1000000007
k = int(input())
s = len(input().strip())
t = k+s
fact = [1]
p25 = [1]
for i in range(1,t+1):
    fact += [(fact[-1] * i)%M]
    if i<=k:
        p25  += [(p25[-1] * 25) % M]

inv = [1]*(t+1)
inv[t] = pow(fact[t], M-2, M)
for i in range(t-1, -1, -1):
    inv[i] = inv[i+1] * (i+1) % M


res = 0
for i in range(k+1):
    res+=nCr(t,t-i)*p25[i]
    res%=M
print(res)
# Buggy code:
k = int(input())
s = input()

mod = 10**9+7
n = len(s) + k

frac = [1]*(n+1)
finv = [1]*(n+1)
for i in range(n):
    frac[i+1] = (i+1)*frac[i]%mod
finv[-1] = pow(frac[-1],mod-2,mod)
for i in range(1,n+1):
    finv[n-i] = finv[n-i+1]*(n-i+1)%mod
print(finv,frac)
def nCr(n,r,m):
    if n<0 or r<0 or n<r: return 0
    r = min(r,n-r)
    return frac[n]*finv[n-r]*finv[r]%mod
a,b = [1],[1]
for _ in range(k+1):
    a.append(a[-1]*25%mod)
    b.append(b[-1]*26%mod)
n = len(s)
ans = 0
for i in range(k+1):
    ans += a[i]*b[k-i]*nCr(i+n-1,n-1,mod)
    ans %= mod
print(ans)

# Fixed code:
k = int(input())
s = input()

mod = 10**9+7
n = len(s) + k

frac = [1]*(n+1)
finv = [1]*(n+1)
for i in range(n):
    frac[i+1] = (i+1)*frac[i]%mod
finv[-1] = pow(frac[-1],mod-2,mod)
for i in range(1,n+1):
    finv[n-i] = finv[n-i+1]*(n-i+1)%mod
def nCr(n,r,m):
    if n<0 or r<0 or n<r: return 0
    r = min(r,n-r)
    return frac[n]*finv[n-r]*finv[r]%mod
a,b = [1],[1]
for _ in range(k+1):
    a.append(a[-1]*25%mod)
    b.append(b[-1]*26%mod)
n = len(s)
ans = 0
for i in range(k+1):
    ans += a[i]*b[k-i]*nCr(i+n-1,n-1,mod)
    ans %= mod
print(ans)
# Buggy code:
def calc_inv(n, mod_n):
    inv_li = [0] * (n + 2)
    inv_li[0] = 0
    inv_li[1] = 1
    for i in range(2, n + 2):
        q, r = divmod(mod_n, i)
        inv_li[i] = -inv_li[r] * q % mod_n
    return inv_li


MOD = 10**9 + 7
inv = calc_inv(max(K, 26) + 10, MOD)

K = int(input())
S = input()
s_len = len(S)


ans = 0
p = pow(26, K, MOD)

for i in range(1, K + 2):
    ans = (ans + p % MOD) % MOD
    p = p * (s_len + i - 1) * inv[i] * 25 * inv[26] % MOD

print(ans)


# Fixed code:
def calc_inv(n, mod_n):
    inv_li = [0] * (n + 2)
    inv_li[0] = 0
    inv_li[1] = 1
    for i in range(2, n + 2):
        q, r = divmod(mod_n, i)
        inv_li[i] = -inv_li[r] * q % mod_n
    return inv_li


K = int(input())
S = input()
s_len = len(S)

MOD = 10**9 + 7
inv = calc_inv(max(K, 26) + 10, MOD)

ans = 0
p = pow(26, K, MOD)

for i in range(1, K + 2):
    ans = (ans + p % MOD) % MOD
    p = p * (s_len + i - 1) * inv[i] * 25 * inv[26] % MOD

print(ans)
# Buggy code:
import sys

def input():
    return sys.stdin.readline().strip()

def main():
    K = int(input())
    S = input()

    mod = 10 ** 9 + 7
    n = len(S)
    ans = 0

    fact =[1,1]
    factinv = [1,1]


    for i in range(2,K+n):
        fact.append((fact[-1] * i) % mod)
        factinv.append(pow(fact[-1],mod-2,mod))

    def nCr(n,r):
        return (fact[n] * factinv[r] * factinv[n-r]) % mod

    for i in range(K+1):
        ans += ((25 ** i * nCr(i+n-1,n-1)) * (26 ** (K - i))) % mod
    print(ans)

if __name__ == "__main__":
    main()

# Fixed code:
import sys

def input():
    return sys.stdin.readline().strip()

def main():
    K = int(input())
    S = input()

    mod = 10 ** 9 + 7
    n = len(S)
    ans = 0

    fact =[1]*(K+n)
    factinv = [1]*(K+n)
    inv = [0,1]


    for i in range(2,K+n):
        fact[i] = (fact[i-1] * i) % mod
        inv.append((-inv[mod % i] * (mod // i)) % mod)
        factinv[i] = (factinv[i-1] * inv[i]) % mod

    def nCr(n,r):
        r = min(r,n-r)
        return (fact[n] * factinv[r] * factinv[n-r]) % mod

    for i in range(K+1):
        tmp = pow(25,i,mod)
        tmp *= nCr(i+n-1,n-1)
        tmp *= pow(26,K-i,mod)
        ans += tmp
        ans %= mod
    print(ans)

if __name__ == "__main__":
    main()
# Buggy code:
K = int(input())
S = input()

m = 1000000007

result = 0
t = pow(26, K, m)
u = pow(26, -1, m) * 25 % m
l = len(S)
for i in range(K + 1):
    # result += pow(26, K - i, m) * mcomb(len(S) - 1 + i, i) * pow(25, i, m)
    result += (result + t) % m
    t = (t * u) % m * (l + i) %m * pow(i + 1, -1, m) % m
print(result)


# Fixed code:
K = int(input())
S = input()

m = 1000000007

result = 0
t = pow(26, K, m)
u = pow(26, -1, m) * 25 % m
l = len(S)
for i in range(K + 1):
    # result += pow(26, K - i, m) * mcomb(len(S) - 1 + i, i) * pow(25, i, m)
    result = (result + t) % m
    t = (t * u) % m * (l + i) * pow(i + 1, -1, m) % m
print(result)
# Buggy code:
K = int(input())
S = input()
X = len(S)
mod = 10**9+7

ans = pow(26,K,mod)

Y = 25*pow(26, mod-2, mod)

for i in range(X+1,K+X+1):
   
    temp *= Y
    temp %= mod
    
    temp *= i-1
    temp %= mod
    
    temp *= pow(i-X, mod-2, mod)
    temp %= mod    

    ans += temp
    ans %= mod

print(ans)

# Fixed code:
K = int(input())
S = input()
X = len(S)
mod = 10**9+7

temp = pow(26,K,mod)
ans = pow(26,K,mod)

Y = 25*pow(26, mod-2, mod)

for i in range(X+1,K+X+1):
   
    temp *= Y
    temp %= mod
    
    temp *= i-1
    temp %= mod
    
    temp *= pow(i-X, mod-2, mod)
    temp %= mod    

    ans += temp
    ans %= mod

print(ans)