function Main (input) {
  input = input.split("\n").map(inp => inp.split(""));
  var S = input[0];
  var T = input[1];
  var ans = "";
  var i = 0;
  while (true) {
    if (typeof S[i] == "undefined" && typeof T[i] == "undefined") {
      break;
    }
    else {
      ans += S[i];
      if (typeof T[i] != "undefined") {
        ans += T[i];
      }
    }
    i++
  }
  console.log(ans);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));