HackerRank Display an element of an array problem solution

In this HackerRank Display an element of an array problem solution we have given a list of countries, each on a new line, your task is to read them into an array and then display the element indexed at 3. Note that indexing starts from 0.

Input Format

A list of country names. The only characters present in the country names will be upper or lower-case characters and hyphens.

Output Format

The element at index 3 of the array (one string).

Problem solution.

sed -n 4p

Second solution.

 arr=($(cat))
echo ${arr[3]}

Third solution.

for((i=0; ;i++))
do
    read a[$i]
    if [ $? -ne 0 ]
    then
        break
    fi
done

echo ${a[3]}

Fourth solution.

#!/bin/sh

a=()

while read i; do
    a[${#a[@]}]="$i"
done

echo "${a[3]}"