function solution(s){
if(s.length % 2 === 1) return 0;
let stack = [s[0]];
for(var i=1; i<s.length; i++){
//console.log(stack)
if(stack[stack.length-1] === s[i]){
//stack = stack.slice(0, stack.length-1);
stack.pop();
} else {
//stack += s[i];
stack.push(s[i]);
}
}
let answer = stack.length > 0 ? 0 : 1;
return answer;
}