src.c:1:16: error: empty character constant
str1=str(input(''))
^
src.c:1:6: error: initializer element is not constant
str1=str(input(''))
^
src.c:2:1: error: expected ',' or ';' before 'a_list'
a_list=str1.split('')
^
src.c:2:19: error: empty character constant
a_list=str1.split('')
^