```go
package main

import "fmt"

func main() {
	var s string
	fmt.Scan(&s)

	distinct := make(map[rune]bool)
	for _, char := range s {
		distinct[char] = true
	}

	if len(distinct)%2 == 0 {
		fmt.Println("CHAT WITH HER!")
	} else {
		fmt.Println("IGNORE HIM!")
	}
}
```