#!/usr/bin/env python

import base64
import sys

def main():
    if hasattr(sys.stdout, 'buffer'):
        sys.stdout = sys.stdout.buffer
    encoded = sys.stdin.read()
    try:
        decoded = base64.standard_b64decode(encoded)
    except Exception:
        sys.stderr.write('Error decoding base64\n')
        sys.exit(1)
    else:
        try:
            sys.stdout.write(decoded.decode('utf-16').encode('utf-8'))
        except UnicodeDecodeError:
            sys.stderr.write('Error decoding UTF16\n')
            sys.exit(1)
        except UnicodeEncodeError:
            sys.stderr.write('Error encoding UTF8\n')
            sys.exit(1)

if __name__ == '__main__':
    main()