package main

import "fmt"

func LargestGoodInteger(num string) string {
	max := ""

	for i := 0; i < len(num)-2; i++ {
		if num[i] == num[i+1] && num[i] == num[i+2] {
			current := string([]byte{num[i], num[i], num[i]})

			if current > max {
				max = current
			}
		}
	}

	return max
}

func main() {
	fmt.Println(LargestGoodInteger("7636669283"))
}