const readline = require('readline');
 
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});
 
const checkIfLineContainsTwoTimesChars = line => {
  const arr = line.split('');
  const hash = new Map();
  let result = false;
 
  for (let i = 0; i < arr.length; i++) {
    if (hash.get(arr[i]) === undefined) {
      hash.set(arr[i], 1);
    } else {
      const value = hash.get(arr[i]);
      if (value) {
        hash.set(arr[i], value + 1);
      }
    }
  }
 
  hash.forEach((v, k) => {
    if (v==2) result = true;
  });
 
  return result;
};
 
rl.on('line', (input) => {
  	if (checkIfLineContainsTwoTimesChars(input)) {
  		 rl.output.write(input +'\n');
    }
});
 

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