N=int(input())
A=[]
S='NUPC'
for i in range(1,3):
  for j in range(1,3):
    for k in range(1,3):
      for l in range(1,3):
        ans=[];D=[i,j,k,l]
        for m in range(4):
          ans.append(S[m])
          if D[m]==2:
            ans=ans+ans
        A.append(''.join(ans))
          
          
A=sorted(A)
print(A[N-1])