function Main(input) {
	var A = input.split(" ")[0];
  var B = input.split(" ")[1];
  
  if(A == "H" && B == "H"){
     console.log("H");
     }else if(A == "H" && B == "D"){
    console.log("D");
  }else if(A == "D" && B == "H"){
           console.log("D");
           }else{
           console.log("H");
           }
  
}

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