#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
string k,str,s,ans;
int main(){
	cin>>k;
	cin>>s;
	int lenk=k.length(),lens=s.length(),i;
	cout<<lens<<endl;
	for(i=0;i<lens;i++){
		int t=i;
		str[i]=k[t%lenk];
}
	cout<<lens<<endl;
	for(i=0;i<lens;i++){
		ans[i]=str[i]+s[i]-'a';
		if(ans[i]>'z')
			ans[i]-=27;		
	}
	cout<<ans;
	return 0;
}