#include<stdio.h>
#include<string.h>

int main(){
    char str[10];
    printf("Enter the string\n");
    scanf("%9s",str);

    char smallest = str[0];
    char largest = str[0];

    for(int i = 1  ; str[i] != '\0' ; i++){
        if(str[i] < smallest) smallest = str[i];
        if(str[i] > largest) largest = str[i];
    }

    char pin[6];
    pin[0] = smallest;
    pin[1] = largest;
    pin[2] = '@';
    pin[3] = smallest;
    pin[4] = largest;
    pin[5] = '\0';
    printf("PIN: %s" ,pin);
    return 0 ;
}