void main() {
    string o = readln.chomp;
    string e = readln.chomp;
    string password;
    foreach (i; 0 .. e.length) {
        password ~= o[i];
        password ~= e[i];
    }
    if (o.length != e.length) password ~= o[$-1];
    password.writeln;
}

import std.stdio;
import std.string;
import std.array;
import std.conv;
import std.algorithm;
import std.range;
import std.math;
import std.numeric;
import std.container;
import std.typecons;
import std.ascii;
import std.uni;