def selectionSort(alist):

    for l in range(len(alist )-1,0,-1):
        positionOfMax =0

        for location in range (1, l+1):
            if alist[location]>alist[ positionOfMax ]:
                positionOfMax = location

        temp = alist[l]
        alist[l] = alist[positionOfMax]
        alist[positionOfMax] = temp

alist = [54 ,26 ,93 ,17 ,77 ,31 ,44 ,55 ,20]
selectionSort(alist)
print(alist)