Longest Word

function LongestWord(sen) { 
  sen = sen.trim();
  sen = sen.replace(/[^a-zA-Z0-9 ]/g, '');
  sen = sen.split(" ");
  let ret = sen[0];
  sen.forEach((str) => {if(str.length>ret.length) ret = str} )
  // code goes here  
  return ret; 

}
   
// keep this function call here 
console.log(LongestWord(readline()));