function solve(arr1,arr2){
  let mainArr = arr1;
  let commands = arr2;
  for(let i = 0; i < commands.length;i++){
      let currentCommand = commands[i].split(" ").shift();
      if(currentCommand === "add"){
          let index = +commands[i].split(" ")[1];
          let element = +commands[i].split(" ")[2];
          mainArr.splice(index,0,element);
      }else if(currentCommand === "addMany"){
          let index = +commands[i].split(" ")[1];
          let final = commands[i].split(" ");
          for(let n = 2; n< final.length; n++){
              let currentNum = +final[n];
              mainArr.splice(index,0,currentNum);
              index++;
          }
      }else if(currentCommand === "contains"){
          let numToFind = +commands[i].split(" ")[1];
          let index = mainArr.indexOf(numToFind);
          console.log(index);
      }else if(currentCommand === "remove"){
         let index = +commands[i].split(" ")[1];
         mainArr.splice(index,1);
      }else if(currentCommand === "shift"){
          let position = +commands[i].split(" ")[1];
          for(let i = 1; i<= position;i++){
              let firstNum = mainArr.shift();
              mainArr.push(firstNum);
          }
      }else if(currentCommand === "sumPairs"){
          let currentArr = []
          for(let i = 0; i < mainArr.length-1;i++){
             let sum = 0;
             sum = +mainArr[i] + +mainArr[i+1];
              currentArr.push(sum)
              i++;
          }
          if(mainArr.length % 2 !== 0){
            currentArr.push(mainArr[mainArr.length-1])

          }
          mainArr = currentArr;
      }
  }
   console.log(mainArr);
}