package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	t := 0
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	rows := r.Intn(100)
	for x := 1; x <= rows; x++ {
		if x > rows/2 {
			t--
		} else {
			t++
		}
		for y := 0; y < t; y++ {
			fmt.Print("*")
		}
		fmt.Print("\n")
	}
}