export default function (data) {
  // your code starts here
  const newMatrix = []
  const result = data.reduce((acc,currRow,rowIndex)=>{
      acc = currRow.map((currNum,colIndex)=>{
          let sum = 0
          if ((data[rowIndex-1] )!== undefined){
              sum+=data[rowIndex-1][colIndex]
          } else {
              sum += 0
          }
          if ((data[rowIndex +1])!==undefined){
            sum += data[rowIndex +1][colIndex]
          } else {
              sum += 0
          }
          if ((data[colIndex -1])!==undefined){
            sum-= data[rowIndex][colIndex -1]
          } else {
              sum += 0
          }
          if ((data[colIndex+1])!==undefined){
            sum-=data[rowIndex][colIndex+1]
          } else {
              sum += 0
          }
          currNum = sum
          return currNum
      })
      newMatrix.push(acc)
      return newMatrix
  },[])
  return result
  // your code ends here
}