Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *s) {
    int i=0,n=0,a=0,m=0;
    while(s[i]){
        if(s[i]>='0'&&s[i]<='9'){
            n=1;
        }
        else if((s[i]>='A' && s[i]<='Z')||(s[i]>='a' && s[i]<='z')){
            a=1;
        } 
        else m=1;
        if(a && n)
        m=1;
        i++;
    }
    if(m) printf("MIXED");
    else if(a) printf("ALPHABETIC");
    else 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