import java.util.*

class StringIterator(val s : String){
  inline fun next() = if (i < s.length) s[i++] else throw NoSuchElementException()
  inline fun hasNext() = i < s.length
  private var i = 0
}
 
inline fun String.iterator() = StringIterator(this)

fun main(args : Array<String>) {
  if (args.size == 0) {
    System.out?.println(0)
    return
  }

  var line = ""
  for (arg in args) {
    line += arg + ' '
  }

  var longest = 0
  var current = 0

  for (c in line) {
    if ((c in 'a'..'z') || (c in 'A'..'Z')) {
      current = current + 1
    } else {
      if (current > longest) {
        longest = current
      }
      current = 0
    }
  }

  if (current > longest) {
    longest = current
  }

  System.out?.println(longest)
}