src.c:1:9: error: empty character constant
a=input('')
^
src.c:1:3: error: initializer element is not constant
a=input('')
^
src.c:2:1: error: expected ',' or ';' before 'print'
print(a.replace('Dr.',''))
^
src.c:2:23: error: empty character constant
print(a.replace('Dr.',''))
^
src.c:4:13: error: empty character constant
a=int(input(''))
^
src.c:5:13: error: empty character constant
b=int(input(''))
^