class Solution {
  public int minimumLength(String s) {
    int i = 0;
    int j = s.length() - 1;

    while (i < j && s.charAt(i) == s.charAt(j)) {
      var c = s.charAt(i);

      while (i <= j && s.charAt(i) == c) {
        ++i;
      }

      while (j > i && s.charAt(j) == c) {
        --j;
      }
    }

    return j - i + 1;
  }
}