c# Accepted : Easy to understand
\npublic class Solution {\n    public int MinimumSum(int num) {\n        List<int> number=new();\n        while(num>0){\n            number.Add(num%10);\n      
```\npublic class Solution {\n    public int MinimumSum(int num) {\n        List<int> number=new();\n        while(num>0){\n            number.Add(num%10);\n            num/=10;\n        }\n        number.Sort();\n        return (number[0]*10+number[3])+(number[1]*10+number[2]);\n    }\n}\n```
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