#!/usr/bin/env python3

import re

names = dict()

for i in [input() for x in range(int(input()))]:
  i = float(re.sub(r'(\.0*)?L', '', i))
  if i not in names:
    names[i] = ''.join([chr(ord(x) + ord('a') - ord('0')) for x in str(len(names))])
  print(names[i])