var x = 4;
var sequence = [-1, -8, 4, 5, -2, 7];
var min = 0;
var max = 0;
var min2 = 0;
var max2 = 0;
for (i = 0; i < sequence.length; i++){
    if (sequence[i] < min) {
        min = sequence [i];
        }
    if (sequence[i] > max) {
        max = sequence [i];
        }   
    }
    console.log (min, max);
    
for (i = 0; i < sequence.length; i++){    
    if (sequence[i] < min2 && sequence[i] != min) {
        min2 = sequence [i];
        }
    if (sequence[i] > max2 && sequence[i] != max) {
        max = sequence [i];
        }
}

console.log (min2, max2);