Problem: A colored stripe is represented by a horizontal row of n square cells, each cell is pained one of k colors. Your task is to repaint the minimum number of cells so that no two neighbouring cells are of the same color. You can use any color from 1 to k to repaint the cells.

Input

The first input line contains two integers n and k (1 ≤ n ≤ 5·105; 2 ≤ k ≤ 26). The second line contains n uppercase English letters. Letter "A" stands for the first color, letter "B" stands for the second color and so on. The first k English letters may be used. Each letter represents the color of the corresponding cell of the stripe.

Output

Print a single integer — the required minimum number of repaintings. In the second line print any possible variant of the repainted stripe.

Examples

Input

6 3
ABBACC


Output

2
ABCACA


Input

3 2
BBB


Output

1
BAB

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k, i;
  string s, s2;
  cin >> n >> k;
  cin >> s;
  if (k == 2) {
    s2 = s;
    int c = 0, c1 = 0;
    if (s[0] != 'A') s[0] = 'A', c++;
    for (i = 1; i < s.length(); i++) {
      if (s[i] == s[i - 1]) {
        if (s[i] == 'A')
          s[i] = 'B';
        else
          s[i] = 'A';
        c++;
      }
    }
    if (s2[0] != 'B') s2[0] = 'B', c1++;
    for (i = 1; i < s2.length(); i++) {
      if (s2[i] == s2[i - 1]) {
        if (s2[i] == 'A')
          s2[i] = 'B';
        else
          s2[i] = 'A';
        c1++;
      }
    }
    if (c < c1) {
      cout << c << endl << s;
      return 0;
    } else {
      cout << c1 << endl << s2;
      return 0;
    }
  }
  int c = 0;
  for (i = 1; i < s.length(); i++) {
    if (s[i] == s[i - 1]) {
      if (i + 1 < s.length()) {
        if (s[i - 1] != 'A' && s[i + 1] != 'A')
          s[i] = 'A';
        else if (s[i - 1] != 'B' && s[i + 1] != 'B')
          s[i] = 'B';
        else if (s[i - 1] != 'C' && s[i + 1] != 'C')
          s[i] = 'C';
      } else {
        if (s[i - 1] == 'A')
          s[i] = 'B';
        else
          s[i] = 'A';
      }
      c++;
    }
  }
  cout << c << endl << s;
  return 0;
}