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 ary = lines[0].split(" ");
  var ary[0] = ary[1];
  var ary[1] = ary[0];
  var str = ary.join("");
  console.log(str);
});