# int2abc.py

# int2abc.py * 17575

import string
alpha = string.letters

def int2abc(z):
    z = min(z,26*26*26-1)
    c = z/(26*26)%26
    b = z/26%26
    a = z%26
    return ''.join([alpha[z] for z in [c,b,a]])


print int2abc(0) # aaa
print int2abc(25) # aaz
print int2abc(26) # aba
print int2abc(26*26*26) # zzz
print 26*26*26