#include<bits/stdc++.h> using namespace std; int main(){ char a[100],b[100],k[200]; int n; cin>>a>>b; cin>>n; int al = strlen(a); int bl = strlen(b); for(int j=0;j<=bl-1;j++){ a[al+j] = b[j]; } cout<<a[n-1]; return 0; }