// readline() 获取用例输入 const inputString = readline(); const wordLastLength = (word) => { if (!word) { return 0; } const wordArr = word.split(' '); if (wordArr.length === 1) { return word.length; } return wordArr[wordArr.length-1].length; }; // console.log打印输出结果 console.log(wordLastLength(inputString));