K = int(input())

NUPC = []
D = {0:"N", 1:"U", 2:"P", 3:"C"}
for bit in range(1<<4):
    S = []
    for i in range(4):
        S.append(D[i])
        if 1<<i & bit:
            S += S
    NUPC.append("".join(S))
NUPC.sort()

print(NUPC[K-1])