#include <iostream> #include <cstring> using namespace std; int main(){ char a[1000],b[1000]; int n,j,i,lena,lenb; cin>>a>>b; cin>>n; lena=strlen(a); lenb=strlen(b); i=lena; for(j=0;j<lenb;j++){ a[i+j]=b[j]; } cout<<a[n-1]<<endl; return 0; }