src.c:1:3: error: 'b' undeclared here (not in a function)
a=b=c=0
^
src.c:1:5: error: 'c' undeclared here (not in a function)
a=b=c=0
^
src.c:2:1: error: expected ',' or ';' before 'a'
a=int(input())
^