View Compilation Error

0_0_31952099_25794.cpp: In function 'int main()':
0_0_31952099_25794.cpp:6:19: error: redeclaration of 'int i'
     int n,i,j,a,e,i,o,u;
                   ^
0_0_31952099_25794.cpp:6:11: note: 'int i' previously declared here
     int n,i,j,a,e,i,o,u;
           ^