public class Program {
public static void Main() {
char[] inPut = System.Console.ReadLine().ToCharArray();
int result = 0;
for (int i = 0; i < inPut.Length; i++) {
//将字符提取出来并且转化为数字,否则是Ascii值
result += System.Convert.ToInt32(inPut[i])-'0';
}
System.Console.WriteLine(result);
}
}

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