Buggy python submission (verdict: Runtime Error):
import fractions

def lcm(x,y):
    return (x*y) // fractions.gcd(x, y)
    
x, y = map(int, input().split())
s = input()
t = input()

check = [""] * (10**11)
lc = lcm(x,y)

s_l = lc//x
t_l = lc//y

for i in range(x):
    check[i*s_l + 1] = s[i]
    
for i in range(y):
    if check[i*t_l + 1] != t[i] and check[i*t_l + 1] != "":
        print(-1)
        break
else:
    print(lc)



Fixed submission:
import fractions

def lcm(x,y):
    return (x*y) // fractions.gcd(x, y)
    
x, y = map(int, input().split())
s = input()
t = input()

lc = lcm(x,y)

s_l = lc//x
t_l = lc//y

for i in range(y):
    if i%s_l == 0:
        if t[i] == s[i*t_l//s_l]:
            continue
        else:
            print(-1)
            break
else:
    print(lc)

Buggy python submission (verdict: Runtime Error):
import fractions

def lcm(x,y):
    return (x*y) // fractions.gcd(x, y)
    
x, y = map(int, input().split())
s = input()
t = input()

check = [""] * (10**6)
lc = lcm(x,y)

s_l = lc//x
t_l = lc//y

for i in range(x):
    check[i*s_l + 1] = s[i]
    
for i in range(y):
    if check[i*t_l + 1] != t[i] and check[i*t_l + 1] != "":
        print(-1)
        break
else:
    print(lc)



Fixed submission:
import fractions

def lcm(x,y):
    return (x*y) // fractions.gcd(x, y)
    
x, y = map(int, input().split())
s = input()
t = input()

lc = lcm(x,y)

s_l = lc//x
t_l = lc//y

for i in range(y):
    if i%s_l == 0:
        if t[i] == s[i*t_l//s_l]:
            continue
        else:
            print(-1)
            break
else:
    print(lc)

Buggy python submission (verdict: Runtime Error):
import math

def lcm(x,y):
    return (x*y) / math.gcd(x, y)
    
x, y = map(int, input().split())
s = input()
t = input()

check = [""] * (10**6)
lc = lcm(x,y)

s_l = lc/x
t_l = lc/y

for i in range(x):
    check[i*s_l + 1] = s[i]
    
for i in range(y):
    if check[i*t_l + 1] != t[i] and check[i*t_l + 1] != "":
        print(-1)
        break
else:
    print(lc)



Fixed submission:
import fractions

def lcm(x,y):
    return (x*y) // fractions.gcd(x, y)
    
x, y = map(int, input().split())
s = input()
t = input()

lc = lcm(x,y)

s_l = lc//x
t_l = lc//y

for i in range(y):
    if i%s_l == 0:
        if t[i] == s[i*t_l//s_l]:
            continue
        else:
            print(-1)
            break
else:
    print(lc)

Buggy python submission (verdict: Runtime Error):
import math

def lcm(x,y):
    return (x*y) / math.gcd(x, y)
    
x, y = map(int, input().split())
s = input()
t = input()

check = [""] * (10**6)
lc = lcm(x,y)

s_l = lc/x
t_l = lc/y

for i in range(x):
    check[i*s_l + 1] = s[i]
    
for i in range(y):
    if check[i*t_l + 1] != t[i] and check[i*t_l + 1] != "":
        print(-1)
        break
else:
    print(lc)



Fixed submission:
import fractions

def lcm(x,y):
    return (x*y) // fractions.gcd(x, y)
    
x, y = map(int, input().split())
s = input()
t = input()

lc = lcm(x,y)

s_l = lc//x
t_l = lc//y

for i in range(y):
    if i%s_l == 0:
        if t[i] == s[i*t_l//s_l]:
            continue
        else:
            print(-1)
            break
else:
    print(lc)

Buggy python submission (verdict: Runtime Error):
import math

def lcm(x,y):
    return (x*y) // math.gcd(x, y)
    
x, y = map(int, input().split())
s = input()
t = input()

check = [""] * (10**6)
lc = lcm(x,y)

s_l = lc//x
t_l = lc//y

for i in range(x):
    check[i*s_l + 1] = s[i]
    
for i in range(y):
    if check[i*t_l + 1] != t[i] and check[i*t_l + 1] != "":
        print(-1)
        break
else:
    print(lc)



Fixed submission:
import fractions

def lcm(x,y):
    return (x*y) // fractions.gcd(x, y)
    
x, y = map(int, input().split())
s = input()
t = input()

lc = lcm(x,y)

s_l = lc//x
t_l = lc//y

for i in range(y):
    if i%s_l == 0:
        if t[i] == s[i*t_l//s_l]:
            continue
        else:
            print(-1)
            break
else:
    print(lc)