function processData(input) { var lines = input.split('\n'); var n = Number(lines[0]);

for (var i=1; i<=n; ++i){
    var ops=0;
    var first_loc = 0;
    var last_loc = lines[i].length -1;
    do{
        var first = lines[i].charCodeAt(first_loc);
        var last = lines[i].charCodeAt(last_loc);
        if(first!=last){
            ops+= Math.abs(first-last);
        }
        ++first_loc;
        --last_loc;
    }while(first_loc<=last_loc);
    console.log(ops);
}

}

Runs in all cases