Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func configure(scanner *bufio.Scanner) {
	// scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
	scanned := scanner.Scan()
	if !scanned {
		panic("scan failed")
	}
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	configure(scanner)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	for s := getNextString(scanner); s != "END OF INPUT"; s = getNextString(scanner) {
		ss := strings.Split(s, " ")
		for i := 0; i < len(ss); i++ {
			fmt.Fprint(writer, len(ss[i]))
		}
		fmt.Fprintln(writer, "")
	}
}

C++: #include <iostream>
#include <string>
using namespace std;

int main() {
    while(true) {
        string s;
        getline(cin, s);
        if (s == "END OF INPUT") return 0;
        int count = 0;
        for (int i = 0; i < s.size(); i++) {
            if (s[i] == ' ') {
                cout << count;
                count = 0;
            } else {
                count++;
                if (i == s.size() - 1) {
                    cout << count;
                }
            }
        }
        cout << endl;
    }
}

C++: #include <iostream>
#include <sstream>
using namespace std;

int main() {
  string str, s;
  
  while(getline(cin,str)) {
    if(str == "END OF INPUT") break;
    stringstream ss(str);
    while(ss >> s) {
      cout << s.size();
    }
    cout << endl;
  }
  
  return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <queue>
#include <stack>
#include <vector>
#include <algorithm>
#include <string>
#include <cstring>
#include <cmath>
#include <complex>
#include <map>
#include <climits>
#include <sstream>
using namespace std;

#define reep(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n) reep((i),0,(n))
#define ALL(v) (v).begin(),(v).end()
#define PB push_back
#define EPS 1e-8
#define F first
#define S second
#define mkp make_pair

static const double PI=6*asin(0.5);
typedef long long ll;
typedef complex<double> CP;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<int> vint;
static const int INF=1<<24;

template <class T>
void initvv(vector<vector<T> > &v,int a,int b, const T  &t = T()){
	v.assign(a,vector<T>(b,t));
}

//v.erase(unique(v.begin(),v.end()),v.end());

int main(){
	string END="END OF INPUT";
	string s;
	while(getline(cin,s)){
		if(s.substr(0,12)==END){
			// cout<<0<<endl;
			break;
		}
		s=" "+s+" ";
		int n=s.size();
		rep(i,n){
			// if(i) cout<<" ";
			if(i==n-1){
				break;
			}
			if(s[i]==' '){
				// cout<<"i = "<<i<<endl;
				int cnt=0;
				reep(j,i+1,n){
					if(s[j]==' '){
						i=j-1;
						break;
					}
					else{
						// cout<<j<<" "<<s[j]<<endl;
						cnt++;
					}
				}
				cout<<cnt;
			}
		}
		cout<<endl;
	}
}

C++: #include <iostream>
#include <string>

using namespace std;

/** Application main entry point. */
int main (
  int     argc,
  char  * argv[ ]
  )
{
  for ( ; ; )
  {
    int           res = 0;
    string        s;
    const char  * p;

    getline ( cin, s );
    if ( s == "END OF INPUT" )  break ;

    for ( p = s.c_str ( ); *p != '\0'; ++p )
    {
      if ( isspace ( *p ) )
      {
        cout << res;
        res = 0;
      }
      else
      {
        ++res;
      }
    }
    cout << res << endl;
  }

  return ( 0 );
}

C++: # include <bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
const double PI = acos(-1);
template<class T>constexpr T INF() { return ::std::numeric_limits<T>::max(); }
template<class T>constexpr T HINF() { return INF<T>() / 2; }
template <typename T_char>T_char TL(T_char cX) { return tolower(cX); };
template <typename T_char>T_char TU(T_char cX) { return toupper(cX); };
template<typename T>vector<T> make_v(size_t a){ return vector<T>(a); }
template<typename T,typename... Ts>auto make_v(size_t a, Ts... ts){ return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...)); }
template<typename T,typename V>typename enable_if<is_class<T>::value==0>::type fill_v(T &t, const V &v){ t = v; }
template<typename T,typename V>typename enable_if<is_class<T>::value!=0>::type fill_v(T &t, const V &v){ for(auto &e : t) fill_v(e, v); }
const int vy[] = { -1, -1, -1, 0, 1, 1, 1, 0 }, vx[] = { -1, 0, 1, 1, 1, 0, -1, -1 };
const int dx[4] = { 0,1,0,-1 }, dy[4] = { 1,0,-1,0 };
int popcnt(unsigned long long n) { int cnt = 0; for (int i = 0; i < 64; i++)if ((n >> i) & 1)cnt++; return cnt; }
int d_sum(LL n) { int ret = 0; while (n > 0) { ret += n % 10; n /= 10; }return ret; }
int d_cnt(LL n) { int ret = 0; while (n > 0) { ret++; n /= 10; }return ret; }
LL gcd(LL a, LL b) { if (b == 0)return a; return gcd(b, a%b); };
LL lcm(LL a, LL b) { LL g = gcd(a, b); return a / g*b; };
# define ALL(qpqpq)           (qpqpq).begin(),(qpqpq).end()
# define UNIQUE(wpwpw)        sort(ALL((wpwpw)));(wpwpw).erase(unique(ALL((wpwpw))),(wpwpw).end())
# define LOWER(epepe)         transform(ALL((epepe)),(epepe).begin(),TL<char>)
# define UPPER(rprpr)         transform(ALL((rprpr)),(rprpr).begin(),TU<char>)
# define FOR(i,tptpt,ypypy)   for(LL i=(tptpt);i<(ypypy);i++)
# define REP(i,upupu)         FOR(i,0,upupu)
# define INIT                 std::ios::sync_with_stdio(false);std::cin.tie(0)

string s;

int main(){
    while(getline(cin, s)){
        if(s == "END OF INPUT")return 0;
        int cnt = 1;
        for(int i = 1;i <(int)s.size();i++){
            if(('a' <= s[i] && s[i] <= 'z') || ('A' <= s[i] && s[i] <= 'Z')){
                cnt++;
            }else{
                cout << cnt;
                cnt = 0;
            }
        }
        if(cnt)cout << cnt;
        cout << endl;
    }
}

C++: #include <iostream>
#include <cstring>
using namespace std;

int main() {
  string s0;
  while(getline(cin, s0) && s0!="END OF INPUT") {
    string s = s0;
    int p = s.find(" ");
    while(p!=-1) {
      cout << p;
      s = s.substr(p+1);
      p = s.find(" ");
    }
    if (!isalpha(s0[s0.length()-1]))
      cout << 0;
    cout << endl;
  }
}

C++: #include <iostream>
#include <stdio.h>
using namespace std;
int main(){
    string s;
    int temp;
    while(true){
        getline(cin,s);
        if(s=="END OF INPUT")return 0;
        temp=0;
        for(int i=0;i<s.size();i++){
            if(s[i]==' '){
                printf("%d",temp);
                temp=0;
            }
            else temp++;
        }
        printf("%d\n",temp);
    }
}

C++: #include <iostream>

using namespace std;

int main(){
    string a;
    while (getline(cin,a)&&a!="END OF INPUT"){
        int num=0;
        for(int i=0;i<a.length();++i){
            if(a[i]==" ") {
                cout << num;
                num=0;
            }else num++;
        }
        cout << endl;
    }
}