process.stdin.resume();
process.stdin.setEncoding("utf8");
var lines = [];
var reader = require("readline").createInterface({
	input: process.stdin,
	output: process.stdout
});
reader.on("line", (line) => {
	lines.push(line);
});
reader.on("close", () => {
	var s = lines[0], n=[];
	for(var i=0;i<s.length;i++){
		n.push("x");
	}
	console.log(n.join(""));
});