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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;

public class D {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		PrintWriter out = new PrintWriter(System.out);
		char[] s = br.readLine().toCharArray();
		int ch = 'z' - Integer.parseInt(br.readLine());
		for (int i = 0; i < s.length; i++)
			if (s[i] >= 'a' && s[i] <= 'z')
				if (s[i] <= ch)
					s[i] = (char) (s[i] - 'a' + 'A');
		out.println(new String(s));
		br.close();
		out.close();
	}

}
