Codeforces Round #295 (Div. 2) A. Pangram

#include<iostream>

#include<cstring>

#include<cstdio>

using namespace std;

int main()

{

//freopen("i.txt","r",stdin);

//freopen("o.txt","w",stdout);

int a[26];

memset(a,0,sizeof(a));

char s[200];

int n;

scanf("%d",&n);

scanf("%s",s);

for(int i=0;s[i]!='\0';i++)

{

if(s[i]>='A'&&s[i]<='Z')

{

s[i]+=32;

}

}

for(int i=0;s[i]!='\0';i++)

{

a[s[i]-'a']=1;

}

int ok=0;

for(int i=0;i<26;i++)

{

if(a[i]==0)

{

ok=1;

break;

}

}

if(ok)

printf("NO\n");

else

printf("YES\n");

return 0;

}