Test Cases showing wrong

#1

Sir my code is working fine but is showing two of the test cases out of 5 as wrong.
#include
using namespace std;

char Check(char ch)
{
if(ch>=‘A’ && ch<=‘Z’)
return ‘U’;

else if(ch>='a' && ch<='z')
   return 'L';

else
   return 'i';

}

int main() {
char ch;
cin>>ch;

char temp=Check(ch);
cout<<temp;      
return 0;

}

#2

it should be capital I

#3

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