For problem statement at 1000-1999/1000-1099/1030-1039/1032/problemB.txt this is a correct solution, but verifier at 1000-1999/1000-1099/1030-1039/1032/verifierB.go ends with test 4 failed
input:
vlbzgbaicmrajwwhthctcuaxhxkqfdafplsjfbcxoeffrswxpldnjobcsnvlgtemapezqleqyhyzrywjjp
expected: 5 17
vlbzgbaicmrajwwht
hctcuaxhxkqfdafpl
sjfbcxoeffrswxpl*
dnjobcsnvlgtemap*
ezqleqyhyzrywjjp*
got: 5 17
*vlbzgbaicmrajwwh
*thctcuaxhxkqfdaf
*plsjfbcxoeffrswx
pldnjobcsnvlgtema
pezqleqyhyzrywjjp

exit status 1 can you fix the verifier? package main

import (
	"fmt"
	"os"
)

func main() {
	var s string
	fmt.Fscan(os.Stdin, &s)
	if s == "" {
		return
	}

	L := len(s)
	a := (L + 19) / 20
	b := (L + a - 1) / a
	K := a*b - L

	fmt.Printf("%d %d\n", a, b)

	idx := 0
	for i := 0; i < a; i++ {
		stars := 0
		if i < K {
			stars = 1
		}
		chars := b - stars

		for j := 0; j < stars; j++ {
			fmt.Print("*")
		}
		for j := 0; j < chars; j++ {
			fmt.Print(string(s[idx]))
			idx++
		}
		fmt.Println()
	}
}