work/source: In function ‘void input()’:
work/source:81: error: ‘strlen’ was not declared in this scope
work/source:78: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result
work/source:80: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result
