package main

import (
	"fmt"
	"strconv"
)

func main() {
	blocks := generate_blocks()
	fmt.Println(len(blocks))
	fmt.Println(blocks[0])
}

func generate_blocks() []int {

	var blocks []int
	decvals := [9]int{49, 50, 51, 52, 53, 54, 55, 56, 57}

	for counter := 123456789; counter <= 987654321; counter++ {

		// Convert number to string ([]byte)
		digits := strconv.Itoa(counter)

		// Check if every number is only represented only once
		var valid bool
		valid = true
		for decval := range decvals {
			var count int
			for digit := range digits {
				if digits[digit] == byte(decvals[decval]) {
					count = count + 1
				}
			}

			if count != 1 {
				valid = false
			}
		}

		if valid {
			blocks = append(blocks, counter)
		}
	}

	return blocks

}

// counter: 123456789
// 1st Digit: 1 (49)
// 2nd Digit: 2 (50)
// 3rd Digit: 3 (51)
// 4th Digit: 4 (52)
// 5th Digit: 5 (53)
// 6th Digit: 6 (54)
// 7th Digit: 7 (55)
// 8th Digit: 8 (56)
// 9th Digit: 9 (57)

// 362880

// 1 2 3
// 4 5 6
// 7 8 9

// 1: 1 2 3 4 7
// 2: 1 2 3 5 8
// 3: 1 2 3 6 9
// 4: 1 4 5 6 7
// 5: 2 4 5 6 8
// 6: 3 4 5 6 9
// 7: 1 4 7 8 9
// 8: 2 5 7 8 9
// 9: 3 6 7 8 9