Problem:
Score : 200 points

Problem Statement

You are given a string S consisting of lowercase English letters. Determine whether all the characters in S are different.

Constraints

2 ≤ |S| ≤ 26, where |S| denotes the length of S.

S consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

If all the characters in S are different, print yes (case-sensitive); otherwise, print no.

Sample Input 1

uncopyrightable

Sample Output 1

yes

Sample Input 2

different

Sample Output 2

no

Sample Input 3

no

Sample Output 3

yes

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>

int main()
{
	char S[26],d[26];
	int i,j = 0,c = 'a',a=0;
	
	scanf("%s", &S);
	
		i = 0;
		for(c = 'a';;)
		{
			if( c == S[i])
			{
				d[j] = S[i];
				c++;
				j++;
				i = 0;
			}
			else if(S[i] == '\0')
			{
				d[i] = '\0';
				break;
			}
			else
			{
				i++;
				
			}
		}
		for(i = 1; i <= 26; i++)
		{
			if(d[i] == d[i-1])
			{
				printf("no\n");
				a++;
				break;
			}
			else if(d[i] == '\0' && a < 1)
			{
				printf("yes\n");
				break;
			}
		}	
	
	
	
	
	return 0;
}