phrase = 'is this loss?'
result = ''
for i, j in enumerate(phrase):
if i % 2 == 1:
result += phrase[i].upper()
else:
result += phrase[i].lower()
print(result)
cGhyYXNlID0gJ2lzIHRoaXMgbG9zcz8nCnJlc3VsdCA9ICcnCgpmb3IgaSwgaiBpbiBlbnVtZXJhdGUocGhyYXNlKToKICAgIGlmIGkgJSAyID09IDE6CiAgICAgICAgcmVzdWx0ICs9IHBocmFzZVtpXS51cHBlcigpCiAgICBlbHNlOgogICAgICAgIHJlc3VsdCArPSBwaHJhc2VbaV0ubG93ZXIoKQoKcHJpbnQocmVzdWx0KQ==