// editor2
#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main()
{
char s[100];
int i,j;
int seen[256] = {0};
fgets(s,sizeof(s),stdin);
size_t len = strlen(s);
if(len>0&&s[len-1]=='\n'){
s[len-1]='\0';
}
for(i=0;s[i];i++){
if(!(isalnum(s[i])||s[i]==' ')){
printf("Invalid input\n");
return 0;
}
}
for(i=0;s[i];i++){
    if(!seen[(unsigned char)s[i]]){
        printf(" ",s[i]);
        seen[(unsigned char)s[i]]=1;
    }
}
printf("\n");
printf("PoaC");
return 0;
}