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s = input() number = '' d = {} i = 0 while s[i] != '0': if s[i] in '123456789': if s[i] not in d.keys(): d[s[i]] = 1 else: d[s[i]] += 1 i += 1 for key in d.keys(): if d[key] % 3 == 0: d[key] = d[key] // 3 else: number = 'NO' break if number == 'NO': print(number) else: for k in sorted(d.keys()): number += k * d[k] print(number * 3)
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