text: function solve(input){
      let elements = input.split(' ').map((ele)=> ele.toLowerCase());
  
  
      let obj = generateObject(new Set(elements));
  
      elements.forEach((ele)=>{
  
        obj.set(ele, obj.get(ele)+1)
      })
     let output = '';
      Array.from(obj.entries()).forEach((kvpArr) => {
          let [key, value] = kvpArr;
          if (Number(value) %2!==0){
              output+=key + " "
          }
      })
      console.log(output)
  
      function generateObject(set){
          let obj = new Map;
          set.forEach((ele)=>{
              obj.set (ele, 0);
          });
          return obj
      }
  
  }
  solve('Java C# Php PHP Java PhP 3 C# 3 1 5 C#')