/in/foo.c:1:1: warning: data definition has no type or storage class
 s= int(input())
 ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 's' [-Wimplicit-int]
/in/foo.c:1:4: error: expected expression before 'int'
 s= int(input())
    ^~~