import std.conv, std.stdio;
import std.algorithm, std.array, std.range, std.string;
void main()
{
    readln;
    auto buf = cast(ubyte[][])(readln.chomp.split);
    (cast(string)(buf[0].zip(buf[1]).map!(_=> [_[0], _[1]]).joiner.array)).writeln;
}
