import itertools
import sys
input = sys.stdin.readline
K = int(input())
T = []
c = 'NUPC'
for l in itertools.product([1, 2], repeat=4):
    t = []
    for i in range(len(l)):
        t.append(c[i])
        if l[i]==2:
            t.append("".join(t))
    #print(l, t)
    T.append("".join(t))
T.sort()
#print(T)
print(T[K-1])