src.c:1:3: error: expected expression before 'int'
n=int(input(''))
^
src.c:1:13: error: empty character constant
n=int(input(''))
^
src.c:3:3: error: empty character constant
s=''
^
src.c:7:13: error: empty character constant
a=input('')
^
src.c:12:1: error: expected identifier or '(' before 'for'
for i in range(len(s1)):
^