using System;
public class Test
{
public static void Main()
{
// your code goes here
RemoveKdigits("1432219",3);
}
public static string RemoveKdigits(string num, int k) {
if(num.Length==k){return "0";}
int len = num.Length;
string sub = num.Substring(len-k);
Console.WriteLine(sub);
char min=num[0];
Console.WriteLine(min);
for(int i=1;i<len-k;i++){
if(num[i]<min){
min=num[i];
}
}
Console.WriteLine(min);
if(min!='0'){
return min.ToString()+sub;
}else{
return sub;
}
}
}
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