View Compilation Error

0_0_35696518_14712.cpp: In function 'int main()':
0_0_35696518_14712.cpp:15:34: error: expected ')' before ';' token
  while (scanf("%d %c %c",&all_len;&ch1,&ch2)!=EOF)
                                  ^
0_0_35696518_14712.cpp:15:34: error: expected ')' before ';' token
0_0_35696518_14712.cpp:15:44: error: expected ';' before ')' token
  while (scanf("%d %c %c",&all_len;&ch1,&ch2)!=EOF)
                                            ^
0_0_35696518_14712.cpp:67:1: error: expected '}' at end of input
 }
 ^