package main

import (
	"fmt"
)

func a(c chan bool) {
	for i := 0; i < 50; i++ {
		fmt.Print("a")
	}

	c <- true
}

func b(c chan bool) {
	for i := 0; i < 50; i++ {
		fmt.Print("b")
	}

	c <- true
}

func main() {
	c := make(chan bool)
	go a(c)
	go b(c)
	<- c
	<- c
	fmt.Println("end main()")
}