[PYTHON 3] Easy Solution
```py\nclass Solution:\n    def minimumSum(self, num: int) -> int:\n        s=list(str(num))\n        s.sort()\n        return int(s[0]+s[2])+int(s[1]+s[3])
```py\nclass Solution:\n    def minimumSum(self, num: int) -> int:\n        s=list(str(num))\n        s.sort()\n        return int(s[0]+s[2])+int(s[1]+s[3])
['Sorting', 'Python', 'Python3']