$ ./app < input1.txt > user_output1.txt
$ diff output1.txt user_output1.txt -b -B -y -i --suppress-common-lines
A->Ba|Aa|c						      <
B->Bb|Ab|d						      <
A->BaA'|cA'						      <
A'->aA'|$						      <
B->cA'bB'|dB'						      <
B'->bB'|aA'bB'|$					      <
section_end:1561711344:build_script
section_start:1561711344:after_script
section_end:1561711346:after_script
ERROR: Job failed: exit code 1

INFO: Final Memory: 3M/59M
INFO: ------------------------------------------------------------------------
ERROR: Error during SonarQube Scanner execution
ERROR: Unable to execute SonarQube
ERROR: Caused by: Fail to get bootstrap index from server
ERROR: Caused by: Expected URL scheme 'http' or 'https' but no colon was found
ERROR: 
ERROR: Re-run SonarQube Scanner using the -X switch to enable full debug logging.
section_end:1561711330:build_script
section_start:1561711330:after_script
section_end:1561711332:after_script
ERROR: Job failed: exit code 1