#include<iostream> #include<cstring> using namespace std; int main(){ char a[100],b[100]; int n,s1,s2; cin >> a >> b; cin >> n; s1 = strlen(a); s2 = strlen(b); for(int i=s1;i<s1+s2;i++){ a[i] = b[i-s1]; } cout<<a[n-1]; }