Run it from the JavaScript console many times!
texts = {}
array = []
CanvasRenderingContext2D.prototype.fillText = function(a, x, y) {
texts[x] = a
}
eval(document.querySelector('script').innerText)
for (x in texts) array.push(texts[x])
document.querySelector('input[name="solution"]').value = array.join('')
document.querySelector('form').submit()
FLAG :D :D fef9565c97c3a62fe10d2a0084a9e8179d72f4a05084997cb80e900d1a77a42e3