C :

#include<stdio.h>
#include<string.h>
void main()
{
	char x[21];
	while((gets(x))!=NULL)
		printf("%d\n",strlen(x));
}

C++ :

#include <cstdio>
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
	char a[100];
	while(gets(a) != NULL)
	{
		int m = strlen(a);
		cout << m << endl;
	}
}