function problemSolved(input){
    let cnt = 0;
    let stringToCheck = input[0].toLowerCase();
    let pattern = input[1] !== undefined ? input[1].toLowerCase() : ' ';
    while(stringToCheck.indexOf(pattern)!=-1){
        cnt++;
        var index = stringToCheck.indexOf(pattern)+1;
        stringToCheck = stringToCheck.substring(index);
        }
    console.log(cnt);
}