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s=input()
k=input()
ans=""
for i in range(len(s)):
if k[i]=='1':
ans+=s[i]
print(ans)
n,k=map(int,input().split())
ans=(k%n)
if ans==0:
ans=n
print(ans+1)
#Radhika_code
#deloitte
import math
n=int(input())
print(math.factorial(n))
#factorial_code
#deloitte
