/**
 * Counts the occurrences of each character in a given string.
 * @param {string} line - The input string to count characters from.
 * @returns {object} - An object containing the counts of each character.
 */
function getCharCounts(line = '') {
    return line
        .split('')
        .reduce((acc, char) => ({ ...acc, [char]: (acc[char] || 0) + 1 }), {});
}
 
// Read input line by line using the readline function
// Check if any character in each line appears exactly twice, and print the line if so
while ((line = readline())) {
    const charCounts = getCharCounts(line);
 
    if (Object.values(charCounts).some((count) => count === 2)) {
        print(line);
    }
}
 

LyoqCiAqIENvdW50cyB0aGUgb2NjdXJyZW5jZXMgb2YgZWFjaCBjaGFyYWN0ZXIgaW4gYSBnaXZlbiBzdHJpbmcuCiAqIEBwYXJhbSB7c3RyaW5nfSBsaW5lIC0gVGhlIGlucHV0IHN0cmluZyB0byBjb3VudCBjaGFyYWN0ZXJzIGZyb20uCiAqIEByZXR1cm5zIHtvYmplY3R9IC0gQW4gb2JqZWN0IGNvbnRhaW5pbmcgdGhlIGNvdW50cyBvZiBlYWNoIGNoYXJhY3Rlci4KICovCmZ1bmN0aW9uIGdldENoYXJDb3VudHMobGluZSA9ICcnKSB7CiAgICByZXR1cm4gbGluZQogICAgICAgIC5zcGxpdCgnJykKICAgICAgICAucmVkdWNlKChhY2MsIGNoYXIpID0+ICh7IC4uLmFjYywgW2NoYXJdOiAoYWNjW2NoYXJdIHx8IDApICsgMSB9KSwge30pOwp9CgovLyBSZWFkIGlucHV0IGxpbmUgYnkgbGluZSB1c2luZyB0aGUgcmVhZGxpbmUgZnVuY3Rpb24KLy8gQ2hlY2sgaWYgYW55IGNoYXJhY3RlciBpbiBlYWNoIGxpbmUgYXBwZWFycyBleGFjdGx5IHR3aWNlLCBhbmQgcHJpbnQgdGhlIGxpbmUgaWYgc28Kd2hpbGUgKChsaW5lID0gcmVhZGxpbmUoKSkpIHsKICAgIGNvbnN0IGNoYXJDb3VudHMgPSBnZXRDaGFyQ291bnRzKGxpbmUpOwoKICAgIGlmIChPYmplY3QudmFsdWVzKGNoYXJDb3VudHMpLnNvbWUoKGNvdW50KSA9PiBjb3VudCA9PT0gMikpIHsKICAgICAgICBwcmludChsaW5lKTsKICAgIH0KfQo=

YXNkZgpmZGFzCmFzZHMKZCBmbQpkZmFhCmFhYWEKYWFiYgphYWFiYg==

asdf
fdas
asds
d fm
dfaa
aaaa
aabb
aaabb