#include<iostream>
#include<math.h>
using namespace std;
int main(){
int m1,m2,m3,total;
float Avg;
cout<<"enter marks of 3 subjects"<<endl;
cin>>m1>>m2>>m3;
total=m1 + m2 + m3;
Avg = total/3.0;
if(Avg>=60)
cout<<"a"<<endl;
else if(Avg>=35&&Avg<60)
cout<<"b"<<endl;
else
cout<<"c"<<endl;
return 0;
}
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