#include <iostream>
#include <string.h>
#include<stdio.h>
using namespace std;
char a[101], b[101], s[101];
int i=0,j,ok=1;
int main()
{cout<<'cuvant1:'; cin>>a;
cout<<'cuvant2:'; cin>>b;
do
{
if(a[strlen(a]-1-i)]==b[strlen(b)-1-i])
    S[i]=a[strlen(a)-1-i]

else ok=0;
i++
}
while(ok!=0)
    for(j=strlen(s))-1;j>=a;j++)
    cout<<s[j];
return 0;

}