process.stdin.resume();
process.stdin.setEncoding('utf8');
 
// your code goes here
function processLines(input) {
  const lines = input.split("\n");
  lines.forEach((line) => {
    const charCount = {};
 
    for (const char of line) {
      charCount[char] = (charCount[char] || 0) + 1;
    }
 
    if (Object.values(charCount).some((count) => count === 2)) {
      console.log(line);
    }
  });
}
 
 
const input = `asdf
fdas
asds
d fm
dfaa
aaaa
aabb
aaabb`;
 
processLines(input);
 

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