#include <stdio.h>
#include <math.h>

int main () {
  int num=0;
  double rev_num=0; //the number reversed
  double let_dig=0; //remembers what came after what, letters or digits
  long decimal_value=0;
  int i=0,j=0,n=0, counter=0; //i,j,n are help counters
  int dig_1=0,dig_2=0;
  int base=0;
  int smallest_base=1; //represents the smallest base
  printf("Enter a number in a known base: ");
  num = getchar();
  while (num!='\n') {
   // if (num<'a'|| num>'z') {
     // printf("Invalid input!\n");
     // return 0;
   // }
   // if (num<1 || num>9) {
     //	printf("Invalid input!\n");
     //	return 0;
   //   }
    if (num>='1' && num<='9') {
      num = num - '1' + 1;
      rev_num += num * pow(10,i); //the number, reversed
      i++;
      let_dig += 1 * pow(10,j);   //if it's a letter -2, if it's a digit - 1.
      j++;
      base = num + 1;
    }
    else if (num>='a' && num<='z') {
      num=num-'a'+10;
      rev_num += num * pow(10,i);
      i=i+2;
      let_dig += 2 * pow(10,j);
      j++;
      base = num + 1;
    }
    smallest_base = base>smallest_base ? base : smallest_base;
    num=getchar();
  }
  printf("%d", smallest_base);
  printf("rev_num %lf", rev_num);
  printf("let_dig %lf", let_dig);
  printf("i %lf, j %lf", i, j);
  counter=j;
  for (n=0; n<counter; n++) {
    dig_1=(int)(rev_num/pow(10,i-1))%10;
    i--;
    dig_2=(int)(let_dig/pow(10,j-1))%10;
    j--;
    printf("dig2 %d\n", dig_2);
    if (dig_2==2) {
      printf("i = %lf, dig1= %d", i, dig_1);
      dig_1=dig_1*10 + (int)(rev_num/pow(10,i-1))%10;
      printf("dig1 in the loop is: %d\n", dig_1);
      i--;
    }
    printf("dig1 %d", dig_1);
    decimal_value+=(long)(dig_1*pow(smallest_base,n));
    printf("\n decimal-value: %ld\n", decimal_value);
  }
  printf("The smallest possible base for the number is: %d\n", smallest_base);
  printf("The decimal value of that number in base %d is %ld\n", smallest_base, decimal_value);
  return 0;
}