process.stdin.resume();
process.stdin.setEncoding('utf8');
 
let input = require('fs').readFileSync('/dev/stdin', 'utf8');
function hasTwoSameLetters(str) {
	const strArr = str.split("\n");
	strArr.forEach(str => {
		const splitedStr = str.split("");
		const charsCount = splitedStr.reduce((acc, char) => {
	acc[char] = (acc[char] || 0) + 1;
    return acc;
	}, {})
	for (let char in charsCount) {
		if(charsCount[char] === 2) {
			console.log(str)
		}
	}
	})
}
 
hasTwoSameLetters(input)

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

YXNkZgpmZGFzCmFzZHMKZCBmbQpkZmFhCmFhYgphYWFiYg==

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