Problem: Let's define the cost of a string s as the number of index pairs i and j (1 ≤ i < j < |s|) such that s_i = s_j and s_{i+1} = s_{j+1}.

You are given two positive integers n and k. Among all strings with length n that contain only the first k characters of the Latin alphabet, find a string with minimum possible cost. If there are multiple such strings with minimum cost — find any of them.

Input

The only line contains two integers n and k (1 ≤ n ≤ 2 ⋅ 10^5; 1 ≤ k ≤ 26).

Output

Print the string s such that it consists of n characters, each its character is one of the k first Latin letters, and it has the minimum possible cost among all these strings. If there are multiple such strings — print any of them.

Examples

Input


9 4


Output


aabacadbb


Input


5 1


Output


aaaaa

Input


10 26


Output


codeforces

Solution (in JAVA):

Solution:
import java.io.*;
import java.util.*;
 
/**
 * A simple template for competitive programming problems.
 */
public class Solution {
    //InputReader in = new InputReader("input.txt");
    final InputReader in = new InputReader(System.in);
 
    final PrintWriter out = new PrintWriter(System.out);

    void solve() {
        int n = in.nextInt();
        int k = in.nextInt();
        StringBuilder template = new StringBuilder();
        template.append((char)('a'+k-1));
        for(int i=0; i<k-1; i++) {
            for(int j=i+1; j<k-1; j++) {
                template.append((char) ('a' + i));
                template.append((char)('a'+j));
            }
            template.append((char) ('a' + i));
            template.append((char) ('a' + i));
            template.append((char) ('a' + k-1));
        }
        if(n<template.length()) {
            out.println(template.substring(0, n));
        } else {
            StringBuilder ans = new StringBuilder();
            int div = n/template.length();
            int rem = n%template.length();
            for(int i=0; i<div; i++) {
                ans.append(template);
            }
            ans.append(template.substring(0, rem));
            out.println(ans);
        }
    }

    public static void main(final String[] args) throws FileNotFoundException {
        final Solution s = new Solution();
        final Long t1 = System.currentTimeMillis();
        s.solve();
        System.err.println(System.currentTimeMillis() - t1 + " ms");
        s.out.close();
    }

    public Solution() throws FileNotFoundException {
    }

    private static class InputReader {
        private final InputStream stream;
        private final byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;

        InputReader(final InputStream stream) {
            this.stream = stream;
        }

        InputReader(final String fileName) {
            InputStream stream = null;
            try {
                stream = new FileInputStream(fileName);
            } catch (final FileNotFoundException e) {
                e.printStackTrace();
            }
            this.stream = stream;
        }

        int[] nextArray(final int n) {
            final int[] arr = new int[n];
            for (int i = 0; i < n; i++)
                arr[i] = nextInt();
            return arr;
        }

        int[][] nextMatrix(final int n, final int m) {
            final int[][] matrix = new int[n][m];
            for (int i = 0; i < n; i++)
                for (int j = 0; j < m; j++)
                    matrix[i][j] = nextInt();
            return matrix;
        }

        String nextLine() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            final StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            } while (!isEndOfLine(c));
            return res.toString();
        }

        String nextString() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            final StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        long nextLong() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            long res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        int nextInt() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        double nextDouble() {
            return Double.parseDouble(nextString());
        }

        private int read() {
            if (numChars == -1)
                throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (final IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        private boolean isSpaceChar(final int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        private boolean isEndOfLine(final int c) {
            return c == '\n' || c == '\r' || c == -1;
        }
    }
 
}