#!/usr/bin/awk -f
{
    a[l] = $0
    l++
    print NR" "$0
}
END{
    print "Numeric subscripts:"
    for (i = l - 1; i >= 0; i--)
        print i": "a[i]

    print "Actual subscripts:"
    for (i in a)
        print i": "a[i]
}