Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    int digits = 0;
    int alpha = 0;

    for (int i = 0; str[i] != '\0'; i++) {
        if (str[i] >= '0' && str[i] <= '9') {
            digits++;
            continue;
        }

        if (str[i] >= 'a' && str[i] <= 'z') {
            alpha++;
            continue;
        }

        if (str[i] >= 'A' && str[i] <= 'Z') {
            alpha++;
            continue;
        }

        printf("MIXED");
        return;
    }

    if (alpha > 0 && digits == 0) {
        printf("ALPHABETIC");
        return;
    }

    if (alpha == 0 && digits > 0) {
        printf("NUMERIC");
        return;
    }

    printf("MIXED");
}

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