aaabbbcccdddeee
where aaa, bbb, ccc, ddd, and eee stand for 3-digit integers. So if you enter
11 22 33 44 55
everything works out OK, since Fortran finds 11 in the first three columns, 22 in the next three columns, and so on. But if you enter
1 2 3 4 5
Fortran finds ``1 2'' in the first three columns, `` 3 `` in the next three columns, ``4 5'' in the next three columns, and then it runs of input. It does the best that it can, but it's not what you might have expected.