Check if the String Numeric or Alphabetic

Code

#include <stdio.h>
#include <stdint.h>

void classify_string(const char *str) 
{
    int flag1=0,flag2=0,flag3=0;
 for (int i = 0; str[i] != '\0'; i++)
 {
    if(str[i] >= '0' && str[i] <= '9')
    {
        flag1=1;
    }
    else if((str[i] >= 'A' && str[i] <= 'Z') || (str[i]  >= 'a' && str[i]  <= 'z'))
    {
        flag2=1;
    }
    else
    {
        printf("MIXED");
        return;
    }
  }

  if(flag1 && flag2)
  {
     printf("MIXED");
  }
  else if(flag2==1 )
  {
     printf("ALPHABETIC");
  }
  else if(flag1==1 )
  {
      printf("NUMERIC");
  }
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    classify_string(str);
    return 0;
}

Solving Approach