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 N = lines;
  let n1 = lines[0];
  let n2 = lines[1];
  let n3 = lines[2];
  
  var people = [
  { name: 'A', value: n1 },
  { name: 'B', value: n2 },
  { name: 'C', value: n3 }
];

 people.sort(function (a, b) {
  return a.value + b.value;
});
console.log(people[0].name)
console.log(people[1].name)
console.log(people[2].name)
});