View Compilation Error

0_0_30605342_18225.cpp: In function 'int main()':
0_0_30605342_18225.cpp:92:13: error: 'u' was not declared in this scope
             u=read(),v=read(),w=read();
             ^
0_0_30605342_18225.cpp:92:22: error: 'v' was not declared in this scope
             u=read(),v=read(),w=read();
                      ^
0_0_30605342_18225.cpp:92:31: error: 'w' was not declared in this scope
             u=read(),v=read(),w=read();
                               ^