#include <bits/stdc++.h>
int count_rightwhite(int i, int n, const char s[]) {
  int cnt = 0;
  int j;
  for (j = i; j < n; j++) {
    if (s[j] == '.') cnt++;
  }
  return cnt;
}
int main(void) {
  int n;
  char s[200001];
  scanf("%d", &n);
  scanf("%s", s);
  int c[200001] = {0};
  int i = 0, j = 0;
  for (i = 0; i < n; i++) {
    if (j % 2 == 0) {
      if (s[i] == '.') {
        c[j]++;
      } else {
        j++;
        c[j]++;
      }
    } else {
      if (s[i] == '#') {
        c[j]++;
      } else {
        j++;
        c[j]++;
      }
    }
  }
  int cntmin = n;
  int sum_black = 0, sum_white = count_rightwhite(0, n, s);
  for (i = 0; i <= j; i += 2) {
    sum_white -= c[i];
    int tmp = sum_black + sum_white;
    if (cntmin > tmp) {
      cntmin = tmp;
      printf("%d\n", i);
    }
    sum_black += c[i + 1];
  }
  printf("%d\n", cntmin);
  return 0;
}
