Standard input is empty

Standard output is empty

./prog.sh: line 1: https://0...content-available-to-author-only...n.com/a6e8df8c-206a-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 2: https://0...content-available-to-author-only...n.com/14202490-2064-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 3: https://0...content-available-to-author-only...n.com/42417334-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 4: https://0...content-available-to-author-only...n.com/42417335-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 5: https://0...content-available-to-author-only...n.com/42417336-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 6: https://0...content-available-to-author-only...n.com/42417337-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 7: https://0...content-available-to-author-only...n.com/438ca1dc-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 8: https://0...content-available-to-author-only...n.com/43f5ca72-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 9: https://0...content-available-to-author-only...n.com/43f5ca73-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 10: https://0...content-available-to-author-only...n.com/449fc00e-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 11: https://0...content-available-to-author-only...n.com/450b8e10-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 12: https://0...content-available-to-author-only...n.com/450b8e11-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 13: https://0...content-available-to-author-only...n.com/450b8e12-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 14: https://0...content-available-to-author-only...n.com/45ea523a-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 15: https://0...content-available-to-author-only...n.com/46425ebc-206d-11eb-b68b-bc764e088e70.pdf: No such file or directory
./prog.sh: line 16: https://p...content-available-to-author-only...a.io/projects/kaaofnroaOXpxZs6UIvqSQ?language=php: No such file or directory
./prog.sh: line 17: https://p...content-available-to-author-only...a.io/projects/kaaofnroaOXpxZs6UIvqSQ: No such file or directory
./prog.sh: line 18: https://p...content-available-to-author-only...o.com/xLc4PwzPUqfj: No such file or directory