#include<stdio.h>
#include<string.h>
int lengthofLastword(char*s) {
    int len=0;
    int tail=strlen(s)-1;
    while(tail>=0 && s[tail] ==''){
        tail--;
    }
     while(tail>=0 && s[tail]!=''){
        len++;
        tail--;
     }
     return len;
}
void main() {
    char s[21];
    printf("enter a string:");
    fgets(s,sizeof(s),stdin);
    s[strcspn(s,"\n")]='\0';
    int length =lengthofLastword(s);
    printf("The length of the last word is: %d\n,length");
}