Calculate the last word's length

/*
   Function : calculate the last word's length.I wrote again for this question because I think the former solution is too bad...
   Author   : Diamond
   Time     : 2015/06/06  20:58:00.000
*/
#include<iostream>
#include<cstring>
#include<cstdlib>
#include<cstdio>
using namespace std;
int main()
{
    string str;
    getline(cin,str);
    int len=str.length();
    for(int i=len-1;i>=0;i--)
    {
        if(str[i]==' ')
        {
             cout<<len-i-1;
             break;
        }
    }
    return 0;
}

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