Old Books

package main

import (
  "fmt"
  "bufio"
  "os"
)

func main() {
    scanner := bufio.NewScanner(os.Stdin)
    scanner.Scan()
    book := scanner.Text()

    counter := 0

    scanner.Scan()
    input := scanner.Text()

    for input != "NoMoreBooks" && input != book {
        counter++
        scanner.Scan()
        input = scanner.Text()
    }

    if input == book {
        fmt.Printf("You checked %d books and found it.\n", counter)
    } else {
        fmt.Println("The book you search is not here!")
        fmt.Printf("You checked %d books.\n", counter)
    }
}

ИЛИ:

package main

import (
  "fmt"
  "bufio"
  "os"
)

func main() {
    scanner := bufio.NewScanner(os.Stdin)
    scanner.Scan()
    book := scanner.Text()

    for counter := 0; ; counter++ {
        scanner.Scan()
        input := scanner.Text()
        if input == book {
            fmt.Printf("You checked %d books and found it.\n", counter)
            break
        }
        if input == "NoMoreBooks" {
            fmt.Printf("The book you search is not here!\nYou checked %d books.\n", counter)
            break
        }
    }
}