function hasDuplicateCharacters(word) {
    const charCount = {};
 
    for (let char of word) {
        charCount[char] = (charCount[char] || 0) + 1;
    }
 
    for (let char in charCount) {
        if (charCount[char] === 2) {
            return true;
        }
    }
 
    return false;
}
 
function checkDuplicates() {
    const input = readline();
    const words = input.split(" ");
 
    for (let i = 0; i < words.length; i++) {
        if (hasDuplicateCharacters(words[i])) {
            console.log(words[i]);
        }
    }
}
 
checkDuplicates();

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