k = int(input())

n = 4

decompressed = []
nupc = ['N', 'U', 'P', 'C']

for i in range(2 ** n):
    tmp = ""
    for j in range(n):
        tmp += nupc[j]
        if i & (1 << j):
            tmp = tmp + tmp
    decompressed.append(tmp)

decompressed.sort()

print(decompressed[k - 1])