while(line = readline()) {
const arr = line.split('').map(x => x.charCodeAt());
arr.sort((a, b) => a - b);
print(arr.map(x => String.fromCharCode(x)).join(''));
}
while(line = readline()) {
const arr = line.split('').map(x => x.charCodeAt());
arr.sort((a, b) => a - b);
print(arr.map(x => String.fromCharCode(x)).join(''));
}