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public static string KeepNum(string str)
{
char[] tmp = new char[str.Length];
char[] s = str.ToCharArray();
for (int i = 0, j = 0; i < str.Length; i++)
{
if (s[i] >= '0' && s[i] <= '9')
{
tmp[j] = s[i];
j++;
}
}
return new string(tmp);
}
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