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import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.Reader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Locale;
import java.util.StringTokenizer;

public class Main {
	
	private static int gcd(int a, int b) {
		if (a == 0) {
			return b;
		} else {
			return gcd(b % a, a);
		}
	}
	
	private void solve() throws IOException {
		String s = nextToken();
		int n = nextInt();
		
		String res = "";
		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) - 'a' + 1 <= n) {
				res += Character.toUpperCase(s.charAt(i));
			} else {
				res += Character.toLowerCase(s.charAt(i));
			}
		}
		
		println(res);
	}
	
	private static boolean equal(ArrayList<Integer> a, ArrayList<Integer> b) {
		for (int i = 0; i < a.size(); i++) {
			if (a.get(i).equals(b.get(i))) {
				return true;
			}
		}
		return false;
	}
	
	private String nextToken() throws IOException {
		while (tokenizer == null || !tokenizer.hasMoreTokens()) {
			tokenizer = new StringTokenizer(reader.readLine());
		}
		return tokenizer.nextToken();
	}

	private int nextInt() throws NumberFormatException, IOException {
		return Integer.parseInt(nextToken());
	}

	private double nextDouble() throws NumberFormatException, IOException {
		return Double.parseDouble(nextToken());
	}

	private long nextLong() throws IOException {
		return Long.parseLong(nextToken());
	}

	private void print(Object o) {
		writer.print(o);
	}

	private void println(Object o) {
		writer.println(o);
	}

	private void printf(String format, Object... o) {
		writer.printf(format, o);
	}

	public static void main(String[] args) {
		long time = System.currentTimeMillis();
		Locale.setDefault(Locale.US);
		new Main().run();
		System.err.printf("%.3f\n", 1e-3 * (System.currentTimeMillis() - time));
	}

	BufferedReader reader;
	StringTokenizer tokenizer;
	PrintWriter writer;

	private void run() {
		try {
			reader = new BufferedReader(new InputStreamReader(System.in));
			writer = new PrintWriter(System.out);
			solve();
			reader.close();
			writer.close();
		} catch (IOException e) {
			e.printStackTrace();
			System.exit(13);
		}
	}
}