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package main
import (
"bufio"
"fmt"
"os"
"strings"
)
type cave struct {
name string
big bool
leafs []int // index in caves array
}
var (
caves = []cave{cave{name: "start"}, cave{name: "end"}}
score = 0
)
const (
START = 0
END = 1
)
func getIdOrAdd(name string) int {
for i, v := range caves {
if v.name == name {
return i
}
}
caves = append(caves, cave{
name: name,
big: name[0] >= 'A' && name[0] <= 'Z',
})
return len(caves) - 1
}
func contains(id int, passed []int) bool {
for _, v := range passed {
if v == id {
return true
}
}
return false
}
func parcours(id int, passed []int) {
if !caves[id].big {
if contains(id, passed) {
return
}
passed = append(passed, id)
}
for _, v := range caves[id].leafs {
if v == END {
score++
continue
}
parcours(v, passed)
}
}
func main() {
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
line := strings.Split(scanner.Text(), "-")
a := getIdOrAdd(line[0])
b := getIdOrAdd(line[1])
caves[a].leafs = append(caves[a].leafs, b)
caves[b].leafs = append(caves[b].leafs, a)
}
parcours(START, nil)
fmt.Println(score)
}
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