import binascii
import string
def byte_to_binary(n): 
    return ''.join(str((n & (1 << i)) and 1) for i in reversed(range(8))) 
 
def hex_to_binary(h): 
    return ''.join(byte_to_binary(ord(b)) for b in binascii.unhexlify(h)) 
def bintohex(s):
    t = ''.join(chr(int(s[i:i+8],2)) for i in xrange(0, len(s), 8))
    return binascii.hexlify(t)

def convert(a, b, n):
    A = '0123456789ABCDEF'
    num, new_num_string = int(str(n), a), ''
    while num != 0:
        new_num_string, num = A[num % b] + new_num_string, num / b
    return {a: n, b: new_num_string}