test4.in   1   0 letter     't'
test4.in   1   1 letter     'h'
test4.in   1   2 letter     'i'
test4.in   1   3 letter     's'
test4.in   1  60 letter     'b'
test4.in   1  61 letter     'r'
test4.in   1  62 letter     'a'
test4.in   1  63 letter     'c'
test4.in   1  64 letter     'k'
test4.in   1  65 letter     'e'
test4.in   1  66 letter     't'
test4.in   1  67 letter     's'
test4.in   4   0 None       ''