Lower Upper testcase error

#1

#include
using namespace std;
int main() {
char a;
cin>>a;
int text=a;
if(a>=65 && a<=90){
printf("%c\n",a+32);
}
else if(a>=90 && a<=122){
printf("%c\n",a-32);
}
else{
printf(“Invalid Input\n”);
}

return 0;

}

where is the problem?