View Compilation Error

0_0_29422371_23748.cpp: In function 'int main()':
0_0_29422371_23748.cpp:29:16: error: 'MAXN' was not declared in this scope
     char input[MAXN];
                ^
0_0_29422371_23748.cpp:30:22: error: 'input' was not declared in this scope
     while(scanf("%s",input)!=EOF)
                      ^