My Solution in Javascript also works with TypeScript:

function processData(input) {

const query = input.split('\n').slice(1)

const answer = []

for(let i = 0; i < query.length; i++) {
    if(query[i].charAt(0) === '1') {
        const [index, number] = query[i].split(' ')
        answer.push(number) 
    }
    if(query[i].charAt(0) === '2') {
        answer.shift()
    }

    if(query[i].charAt(0) === '3') {
        console.log(answer[0])
    }
}

}