import std.stdio, std.conv, std.algorithm, std.range, std.array, std.string, std.uni;

void main() {
  auto a = readln.chomp;
  auto b = readln.chomp;
  auto res = zip(a,b).map!(a => a[0].to!string ~ a[1].to!string).join;
  if (a.length > b.length) res ~= a[$-1];
  writeln(res);
}
