# include <stdio.h>
# include <string.h>
# define MAXN 80
/** eyresi monadikon grammaton apo alfarithmitiko **/

void addLetter(char ch,char x[])
{
	int size=strlen(x);
	x[size]=ch;
	x[size+1]='\0';
}

void unique(char x[],char pattern[])
{
	int i,j;
	strcpy(pattern,"");
	for(i=0;i<strlen(x);i++)
	{
		int found=0;
		for(j=0;j<strlen(pattern);j++)
		{
			if(pattern[j]==x[i])
			{
				found=1;
				break;
			}
		}
		if(!found) addLetter(x[i],pattern);
	}
}

int main()
{
	char x[MAXN];
	char pattern[MAXN];
	printf("Doste frasi ?\n");
	gets(x);
	unique(x,pattern);
	printf("Monadika grammata %s\n",pattern);
	return 0;
}