qwz19

let arr = [1, 3, 5, -6, 7];
let sum = 0;
for ( let i = 0; i < arr.length; i++) {
if ( arr[i] > 0 ) {
sum += arr[i];
}
if ( arr[i] < 0 ) {
break;
}
}
console.log(sum);

for ( i = 10; i <= 1000; i++) {
let str = String(i);
console.log(str[0]);
}