var tela = 1; 

​

// Open your console to see the output

function setup() {

  createCanvas(400, 400);

  background('grey');

  inp = createInput('');

  inp.position(20, 220);

  inp.size(100);

  inp.input(verificaResposta);

  inp.hide(); 

}

​

function verificaResposta() {

  let r = parseInt(this.value()); 

  console.log('you are typing: ', r);

  if ( r == 4){

    tela = 3; 

  }

}

​

function draw() {

  if ( tela == 2) {

    background(220);

    inp.show(); 

  }

  if(tela == 3){

    background(0);

  }

  if(tela == 1){

    inp.show()

    background(0,0,255);

  }

}