```
class Solution:
def plusOne(self, digits):
dig_str = ""
dig_int = 0
s = []
for i in range(0, len(digits)):
dig_str += str(digits[i])
dig_int = str(int(dig_str) + 1)
for j in range(0, len(dig_int)):
s.append(int(dig_int[j]))
return s
a = [5, 2, 3]
ans = Solution().plusOne
print(ans(a))
```