#!/usr/bin/env python

"""
Translate lists of space separated integers (magnitude less than 62) and print 
as strings of alphanumeric characters. This is useful mainly for some machine
learning algorithms that only take string input.

usage: %prog < int_seqs > strings
"""
from __future__ import print_function

import sys
from itertools import *

table = "012345678ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"


def main():
    for line in sys.stdin:
        ints = [ int( f ) for f in line.split() ]
        if max( ints ) > len( table ):
            raise ValueError("Alphabet size too large!")
        print(str.join( '', [ table[i] for i in ints ] ))

if __name__ == "__main__": main()