Standard input is empty

Standard output is empty

./prog.sh: line 1: https://c...content-available-to-author-only...e.com/files/x/16/2d/238390f2f43699024f3a7dd3ef2a.pdf: No such file or directory
./prog.sh: line 2: https://c...content-available-to-author-only...e.com/files/x/0f/93/e85c85518cba97cb962ebfdba825.pdf: No such file or directory
./prog.sh: line 3: https://c...content-available-to-author-only...e.com/files/x/d7/65/40f79c7a8f9685af773c41e15c9d.pdf: No such file or directory
./prog.sh: line 4: https://c...content-available-to-author-only...e.com/files/x/00/d4/43d270a6a02532d1dfe11851ee3d.pdf: No such file or directory
./prog.sh: line 5: https://p...content-available-to-author-only...a.io/projects/Iz1fi4VzGcPcDsD4Ng_LfQ?language=php: No such file or directory
./prog.sh: line 6: https://p...content-available-to-author-only...a.io/projects/GDmAaeDjJ5XdVNKYUgaGtQ: No such file or directory
./prog.sh: line 7: https://n...content-available-to-author-only...s.io/Nvtw: No such file or directory
./prog.sh: line 8: https://p...content-available-to-author-only...o.com/xzciUBMjJOjd: No such file or directory
./prog.sh: line 9: https://p...content-available-to-author-only...2.org/e2mZhegx: No such file or directory
./prog.sh: line 10: https://p...content-available-to-author-only...n.com/mQ8fc72d: No such file or directory
./prog.sh: line 11: https://w...content-available-to-author-only...8.com/post/1295916/jrhyetrawfdghsdsf: No such file or directory
./prog.sh: line 12: https://w...content-available-to-author-only...3.com/post/1295916/jrhyetrawfdghsdsf: No such file or directory
./prog.sh: line 13: https://w...content-available-to-author-only...8.com/post/1295918/kujuyetrawsfdgdgr: No such file or directory
./prog.sh: line 14: https://w...content-available-to-author-only...3.com/post/1295918/kujuyetrawsfdgdgr: No such file or directory
./prog.sh: line 15: https://p...content-available-to-author-only...k.net/2jr3k: No such file or directory