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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Scanner;
public class Orange {
    public static void main(String[] args) throws IOException {
        BufferedReader in = new BufferedReader (new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
        String s = in.readLine();
        int num = Integer.parseInt(in.readLine());
        char c ;
        for(int i=0;i<s.length();i++){
            int temp =s.charAt(i)-'a';
            if(temp>=0&&temp<num){
                c=  (char) (s.charAt(i)-('a'-'A'));
                out.print(c);
            }   
            else
                out.print(s.charAt(i));
        }
        out.close();
    }
}
