Help me in solving CLB041 problem

My issue

It’s all correct but where was the error

My code

#include <stdio.h>
#include <string.h>

int main() {
    char txt[] = "NumeroTres";
    printf("the length of word is :%d ",strlen(txt));
	// your code goes here
	return 0;

Learning course: Learn C
Problem Link: CodeChef: Practical coding for everyone

There is no error in the code but the printf statement must be exactly like this

printf("The length of the word is: %d ",strlen(txt));