View Compilation Error

2_30942_2456693_31530.cpp: In function 'int main()':
2_30942_2456693_31530.cpp:78:31: error: 'a' was not declared in this scope
     while(scanf("%lld%s%lld",&a,b,&c) != EOF)
                               ^
2_30942_2456693_31530.cpp:78:36: error: 'c' was not declared in this scope
     while(scanf("%lld%s%lld",&a,b,&c) != EOF)
                                    ^