Andrea = [1,2,3,5,4,3] ,
Maria = [3,2,1,2,7,9]

for (let i=0; i < Andrea.length; i++){

if(Andrea[0] === Maria [0]) {
        console.log(Andrea[0])
    } else {
        Andrea[i]+=2
        alert(Andrea[i])
    } else if(Andrea[1] === Maria[1]){
        console.log(Andrea[0])
    }
}