#!/usr/bin/python2.6

"""
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 itertools import *

import sys

table = "012345678ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

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

if __name__ == "__main__": main()