c=[chr(x) for x in range(65,91)+range(97,123)+range(48,58)+[43,47]];a=raw_input();p=(3-(len(a)%3))%3;a+="\x00"*p;a=''.join(["0"*(8-len(x))+x for x in [bin(ord(x)).replace("0b","") for x in a]]);a=[c[int(x,2)] for x in [a[i:i+6] for i in range(0,len(a),6)]];a=''.join(a[:(len(a)-p)])+"="*p;print(a)
Note that non-ascii characters in the above source code will be escaped (such as \x9f).