View Compilation Error

0_0_23520426_20874.cpp: In function 'int main()':
0_0_23520426_20874.cpp:6:14: error: expected initializer before 'while'
     string a while (n--) {
              ^
0_0_23520426_20874.cpp:20:1: error: expected '}' at end of input
 }
 ^