password_problem

#include<stdio.h>
#include<string.h>
int main()
{
    int i, len;
    int  digit_exists = 0, small_letter_exists = 0, capital_letter_exists = 0, symbol_exists = 0;
    char password[10000];

    gets(password);
    len = strlen(password);

   if(len >= 8)
    {

        for(i = 0; i < len; i++)
        {
            if(password[i] >= 'A' && password[i] <= 'Z')
                capital_letter_exists++;

            else if(password[i] >= 'a' && password[i] <= 'z')
                small_letter_exists++;

            else if(password[i] >= '0' && password[i] <= '9')
                    digit_exists++;

            else
                symbol_exists++;
            //capital and small letter and digits na hole seta special character,oitar jonnoi symbol exixts use korsi

        }

    }

        if(small_letter_exists != 0 && capital_letter_exists != 0 && symbol_exists != 0)
        {
            printf("Valid Password!\n");

        }
        else
        {
            printf("Invalid Password!\n");
        }
        return 0;
}