Buggy python submission (verdict: Runtime Error):
import sys
N=int(input())
table=[]
for i in range(N):
    x,y=map(int,input().split())
    table.append((x,y))
L=[0,0]
for x,y in table:
    L[(x+y)%2]=1
if sum(L)==2:
    print(-1)
    sys.exit()
def f(x,y,m):
    s=m
    a=''
    if x>=0:
        a+='R'*x
        s-=x
    else:
        a+='L'*abs(x)
        s-=abs(x)
    if y>=0:
        a+='U'*y
        s-=y
    else:
        a+='D'*abs(y)
        s-=abs(y)
    s=s//2
    a+='LR'*s
    return a
if L[0]==1:
    m=40
    d=[1]*40
    ans=[]
    for x,y in table:
        ans.append(f(x,y,m))
else:
    m=39
    d=[1]*39
    ans=[]
    for x,y in table:
        ans.append(f(x,y,m))

print(m)
print(' '.join(map(str,d)))
for s in ans:
    print(s)

Fixed submission:
import sys
N=int(input())
table=[]
for i in range(N):
    x,y=map(int,input().split())
    table.append((x,y))
L=[0,0]
for x,y in table:
    L[(x+y)%2]=1
if sum(L)==2:
    print(-1)
    sys.exit()
def f(a,b):
    pas=''
    s=a[::-1]
    t=b[::-1]
    A=[0]*31
    B=[0]*31
    for i in range(len(s)):
        if s[i]=='1':
            A[i]=1
    for i in range(len(t)):
        if t[i]=='1':
            B[i]=1
    n=31
    for i in range(n):
        if A[i]==0 and B[i]==0:
            pas+='L'
        if A[i]==0 and B[i]==1:
            pas+='D'
        if A[i]==1 and B[i]==0:
            pas+='U'
        if A[i]==1 and B[i]==1:
            pas+='R'
        
    return pas
if L[0]==1:
    m=32
    d=[1]+[pow(2,i) for i in range(31)]
    ans=[]
    S=[]
    for x,y in table:
        S.append((x-1,y))
    for x,y in S:
        a='R'
        u=(x+y+(pow(2,31)-1))//2
        v=(x-y+(pow(2,31)-1))//2
        u=bin(u)[2:]
        v=bin(v)[2:]
        a+=f(u,v)
        ans.append(a)       
else:
    m=31
    d=[pow(2,i) for i in range(31)]
    ans=[]
    S=table
    for x,y in S:
        a=''
        u=(x+y+(pow(2,31)-1))//2
        v=(x-y+(pow(2,31)-1))//2
        u=bin(u)[2:]
        v=bin(v)[2:]
        a+=f(u,v)
        ans.append(a)      

print(m)
print(' '.join(map(str,d)))
for s in ans:
    print(s)

Buggy python submission (verdict: Runtime Error):
import sys
N=int(input())
table=[]
for i in range(N):
    x,y=map(int,input().split())
    table.append((x,y))
L=[0,0]
for x,y in table:
    L[(x+y)%2]=1
if sum(L)==2:
    print(-1)
    sys.exit()
def f(x,y,m):
    s=m
    a=''
    if x>=0:
        a+='R'*x
        s-=x
    else:
        a+='L'*abs(x)
        s-=abs(x)
    if y>=0:
        a+='U'*y
        s-=y
    else:
        a+='D'*abs(y)
        s-=abs(y)
    a+='LR'*s
    return a
if L[0]==1:
    m=40
    d=[1]*40
    ans=[]
    for x,y in table:
        ans.append(f(x,y,m))
else:
    m=39
    d=[1]*39
    ans=[]
    ans=[]
    for x,y in table:
        ans.append(f(x,y,m))

print(m)
print(' '.join(map(str,d)))
for s in ans:
    print(s)

Fixed submission:
import sys
N=int(input())
table=[]
for i in range(N):
    x,y=map(int,input().split())
    table.append((x,y))
L=[0,0]
for x,y in table:
    L[(x+y)%2]=1
if sum(L)==2:
    print(-1)
    sys.exit()
def f(a,b):
    pas=''
    s=a[::-1]
    t=b[::-1]
    A=[0]*31
    B=[0]*31
    for i in range(len(s)):
        if s[i]=='1':
            A[i]=1
    for i in range(len(t)):
        if t[i]=='1':
            B[i]=1
    n=31
    for i in range(n):
        if A[i]==0 and B[i]==0:
            pas+='L'
        if A[i]==0 and B[i]==1:
            pas+='D'
        if A[i]==1 and B[i]==0:
            pas+='U'
        if A[i]==1 and B[i]==1:
            pas+='R'
        
    return pas
if L[0]==1:
    m=32
    d=[1]+[pow(2,i) for i in range(31)]
    ans=[]
    S=[]
    for x,y in table:
        S.append((x-1,y))
    for x,y in S:
        a='R'
        u=(x+y+(pow(2,31)-1))//2
        v=(x-y+(pow(2,31)-1))//2
        u=bin(u)[2:]
        v=bin(v)[2:]
        a+=f(u,v)
        ans.append(a)       
else:
    m=31
    d=[pow(2,i) for i in range(31)]
    ans=[]
    S=table
    for x,y in S:
        a=''
        u=(x+y+(pow(2,31)-1))//2
        v=(x-y+(pow(2,31)-1))//2
        u=bin(u)[2:]
        v=bin(v)[2:]
        a+=f(u,v)
        ans.append(a)      

print(m)
print(' '.join(map(str,d)))
for s in ans:
    print(s)