#include<iostream>
#include<string>
using namespace std;
char a[100], b[100];
int main(){
	cin >> a >> b;
	int n = 0, m = 0;
	int len1 = strlen(a);
	int len2 = strlen(b);
	while (n < len1||m < len2){
		while (n < len1){ cout << a[n]; n++; break; }
		while (m < len2){ cout << b[m]; m++; break; }
	}
	if (n + m)cout << endl;
}