from string import ascii_lowercase as alphabet

code_string = input().lower()
code_key = input()
# table = str.maketrans(code_key, alphabet)
# print(code_string.translate(table))
decode_string = ''
for sign in code_string:
    if sign in code_key:
        idx = code_key.index(sign)
        decode_string += alphabet[idx]
    else:
        decode_string += sign

print(decode_string)