import std.algorithm;
import std.array;
import std.conv;
import std.math;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;

void main() {
    auto a = read!string;
    auto b = read!string;

    for (int i = 0; i < a.length; i++) {
        write(a[i]);
        if (i < b.length) write(b[i]);
    }
    writeln();
}
