def plusOne(A):
num = 0
A.reverse()
for i in range(len(A)):
num = num + A[i]*10**(i)
return (num + 1)
A = [1,2 ,3, 0]
print(plusOne(A))
ZGVmIHBsdXNPbmUoQSk6CgludW0gPSAwCglBLnJldmVyc2UoKQoJZm9yIGkgaW4gcmFuZ2UobGVuKEEpKToKCQludW0gPSBudW0gKyBBW2ldKjEwKiooaSkKCXJldHVybiAobnVtICsgMSkKCkEgPSBbMSwyICAgICwzLCAwXQpwcmludChwbHVzT25lKEEpKQ==