ALP = 26
freq = ALP * [0]
size = int(input())
string = str(input())
two = False
for iteration in range(size):
index = ord(string[iteration]) - ord('a')
freq[index] += 1
if freq[index] == 2:
two = True
break
output = "No"
if two or size < 2:
output = "Yes"
print(output)#include<bits/stdc++.h>
bool salom(long long x)
{
for (int i = 2; i <= sqrt(x); i++)
{
if (x % i == 0)
{
return false;
}
}
return true;
}
using namespace std;
void wrongontest2()
{int a,cnt=0;
cin>>a;
string x;
cin>>x;
if (a == 1)
{
cout << "YES \n";
return;
}
sort(x.begin(),x.end());
for (int i = 0; i < x.size(); i++)
{
if (x[i] == x[i+1])
{
cnt ++ ;
}
}
if (cnt == 0)
{
cout << "NO \n";
}
else
{
cout << "YES \n";
}
}
int main ()
{
int t=1;
//cin>>t;
while(t--)
{
wrongontest2();
}
}
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