from itertools import product


def main():
    K = int(input())
    odd = "NUPC"

    compression = []
    for even in product((1, 2), repeat=4):
        sentence = ""
        for letter, i in zip(odd, even):
            sentence += letter
            if i == 2:
                sentence += sentence
        compression.append(sentence)
    compression.sort()
    print(compression[K - 1])


if __name__ == "__main__":
    main()