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function strCount(obj){
 const keys = Object.keys(obj);
 let counter = 0;
  
  for (let i = 0; i < keys.length; i++){
    const item = obj[keys[i]];
    if (typeof item  === 'string') counter += 1;
    else if (Array.isArray(item)) {
      for (let j = 0; j < item.length; j++){
        if (typeof item[j] === 'string') counter += 1;
        else if (typeof item[j] === 'object' && typeof item[j] !== 'undefined' && item[j] !== null){
          counter += strCount(item[j])
        }
      }
    }
    else if (typeof item === 'object' && typeof item !== 'undefined' && item !== null){
      counter += strCount(item)
    }
  }
  
  return counter;
}