k = int(input())
n = 4
d = []
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
    d.append(tmp)

d.sort()

print(d[k-1])