val numbers = "0123456789".mapTo(hashSetOf()) { it }
val lowercase = "abcdefghijklmnopqrstuvwxyz".mapTo(hashSetOf()) { it }
val uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".mapTo(hashSetOf()) { it }
val specials = "!@#$%^&*()-+".mapTo(hashSetOf()) { it }

fun main(args: Array<String>) {
  readLine()
  val password = readLine()!!

  // If password is strong, return 0.
  // If password is not strong, return r.
  // If password size < 6, return 6.
  // Otherwise:
  // - If it doesn't contain any lowercase chars, r plus 1.
  // - If it doesn't contain any uppercase chars, r plus 1.
  // - If it doesn't contain any special char, r plus 1.
  fun String.isStrong(): Boolean {
    return this.length >= 6 && !this.any {
      !numbers.contains(it) ||
          !lowercase.contains(it) ||
          !uppercase.contains(it) ||
          !specials.contains(it)
    }
  }

  fun Boolean.toInt() = if (this) 1 else 0

  fun String.getStrongCharCount(): Int =
      setOf(numbers, lowercase, uppercase, specials)
          .map { x -> this.none { x.contains(it) } }
          .map { it.toInt() }
          .sum()

  when {
    password.isStrong() -> println(0)
    else -> println(Math.max(
        password.getStrongCharCount(),
        6 - password.length
    ))
  }
}