eazy-peazy

import base64
s=''
enc = base64.b64decode(b'ZFlSXGVaVGVXbFRjamFlIVAiZFBkZmEkY1BWUmtqampqampQWFQlJCNlYyYnWCVlYyYlbg==')
for i in enc:
    s+=chr(i+15)
print(s)