function CountingMinutes(str) { 

  let arr = str.split("-");
  // console.log(arr[0]);
  // code goes here  
  let day = 24 * 60;
  
  let end = getMinutes(arr[1]);
  let start = getMinutes(arr[0]);
  
 // console.log('end is ' + end);
 // console.log('start is ' + start);
  if (end < start){
    end += day;
  }
  return (end-start) ; 
         
}

function getMinutes(time){
  
  let hr = parseInt(time.split(':')[0]);
  let min = parseInt(time.split(':')[1].match(/[0-9]/g).join(""));
  
  let morning = time.match(/am/g);
  let pm = time.match(/pm/g);
 // console.log(pm);
  if (pm && hr < 12){
    hr += 12;
  }
  else if (morning && hr === 12){ // convert midnight to zero
    hr += 12;
  }
  
  let totalMin = parseInt((hr*60) + min);
  
  return totalMin ;
}