def diagonalDifference(arr):
    sumleft = 0
    sumright = 0
    for i in range(len(arr)):
        for j in range(len(arr)):
            if i == j:
                sumleft+=arr[i][j]
                print(sumleft)
            if i+j==len(arr)-1:
                sumright+=arr[i][j]                
        diff = abs(sumleft-sumright)
    
    return diff