Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
	"unicode/utf8"
)

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	var strs []string
	var a, b, sum int64
	var digits int
	for scanner.Scan() {
		strs = strings.Split(scanner.Text(), " ")
		a, _ = strconv.ParseInt(strs[0], 10, 64)
		b, _ = strconv.ParseInt(strs[1], 10, 64)

		sum = a + b
		// goでlen(string)はbyte数が返る
		digits = utf8.RuneCountInString(strconv.FormatInt(sum, 10))

		fmt.Printf("%d\n", digits)
	}
}

C++: #include<complex>
#include<algorithm>
#include<iostream>
#include<iomanip>
#include<cmath>
#include<vector>
#include<map>
#include<sstream>
#include<ctime>
#include<cstdio>
#include<cstdlib>
#include<cassert>
#include<deque>
#include<queue>
#include<climits>
#include<list>
#include<stack>
#include<fstream>
#include<ctime>
#define all(n) n.begin(),n.end()
#define REP(i,s,n) for(int i=s;i<n;i++)
#define rep(i,n) REP(i,0,n)
#define insert(a,b,c,d) PP(P(a,b),P(c,d))
#define F first
#define S second
#define pb push_back
#define INF (1<<27)
#define EPS 1e-10
#define equals(a,b) (fabs((a)-(b)) < EPS)

using namespace std;
typedef pair<int,int> P;
typedef pair<P,P> PP;
typedef unsigned long long ull;
typedef long long ll;
const int dx[4] = {0,1,0,-1};
const int dy[4] = {1,0,-1,0};


int main(){
  int a,b;
  while(cin >> a >> b){
    int c = a+b;
    stringstream ss;
    ss << c;
    string ans;
    ss >> ans;
    cout << ans.length() << endl;
  }

  /* 
  ofstream ofs("tes");
  ofs << "script -k test.log" << endl;
  system("chmod 755 tes");
  system("at -m -f tes 2:35");
  

  
  system("at exit 2:40");
  system("at cat test.log 2:41");
  */

  cerr << system("more out2.txt") << endl;

return 0;
}

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

int main(){
	int a,b,c;
	int ans;
	int cnt=0;
	
	while(cin>>a>>b){
		//-----test-----
		if(0<=a && a<500) break;
		//if(0<=b && b<500) break;
		
		//--------------
		c=a+b;
		ans=1;
		while(10<=c){
			c/=10;
			ans++;
		}
		cout<<ans<<endl;
		cnt++;
	}
	
	return 0;
}

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

int main() {
	int a, b;
	while(cin >> a >> b) {
		int sum = a + b;
		int ans = 1;
		while((sum /= 10) >= 1) ans++;
		cout << ans << endl;
	}
	return 0;
}

C++: #include <iostream>
#include <cmath>
using namespace std;
int main() {
	int a, b;
	while(1) {
		cin >> a >> b;
		a += b;
		a = (int)log10((double)a) + 1;

		cout << a << endl;
	}
	return 0;
}

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

int main(){
        int a, b;
        while(cin >> a >> b){
                double temp = log10(a + b) + 1 ;
                cout << floor(temp) << endl;
        }
        return 0;
}

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

int main(){
	int a, b, c, result;
	while(cin >> a >> b){
		c = a + b;
		result = 0;
		while(c > 0){
			result++;
			c /= 10;
		}
		cout << result << endl;
	}
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
int main()
{
    int digit{0} , digit1{0} , x , y;

    cin>>x>>y;

    while(x > 0 || y > 0){

      if(x > 0){
        x/=10;
        digit++;
      }
      if(y > 0){
        y/=10;
        digit1++;
      }

    }

    cout<<digit+digit1;

    return 0;
}

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

int main(){
	int a, b;
	while(cin >> a >> b) {
		cout << ::to_string(a + b).length() << endl;
	}
	return 0;
}

C++: #include <iostream>
int main(void){
	int a,b;
	while(std::cin>>a>>b){
		a+=b;
		b=0;
		do{b++,a/=10;}while(a);
		std::cout<<b<<"\n";
	}
}

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

int main(void){
    int a, b, sum, cnt;
    while(cin >> a >> b){
        cnt = 0;
        sum = a+b;
        while(sum){
            sum/=10;
            cnt++;
        }
        cout << cnt <<endl;
    }
    return 0;
}

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

int main() {
	// your code goes here
	long a,b,c,k;
	while(cin >> a >>b){
		k=0;
		c=a+b;
	
		while(c){
			c/=10;
			k++;
		}
	
		cout<<k<<endl;
	}
	
	return 0;
}

C++: #include <iostream>

int main(int argc, char **argv) {
	int a, b, sum, digit = 0;
	std::cin >> a >> b;
	sum = a + b;
	
	while(sum != 0) {
		sum /= 10;
		digit += 1;
	}
	std::cout << digit << std::endl;

}

C++: #include<iostream>
#include<string>
using namespace std;
int main(){
	int a,b;
	int c1=1;
	while(1){
		cin>>a>>b;
		a+=b;
		while(1){
			if(a/10>0){
				++c1;
				a=a/10;
			}
			else
				break;
		}		
		cout<<c1<<endl;
		c1=1;
	}
    return 0;
}

C++: #include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <list>
#include <deque>
#include <algorithm>
#include <iomanip>
#include <functional>

#define REP(i, n) for(int i = 0;i < (n); i++)
#define REP2(i, x, n) for(int i = (x); i < (n); i++)
#define REPR(i, n) for(int i = (n); i >= 0; i--)

#define ALL(a) (a).begin(),(a).end()
#define SORT(c) sort((c).begin(),(c).end())
#define DESCSORT(c) sort(c.begin(), c.end(), greater<int>())

#define LL long long int
#define LD long double

#define PI 3.14159265358979

using namespace std;

//================================================
int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	int A, B;
	while (cin >> A >> B) cout << (int)log10(A + B) + 1 << "\n";
	return 0;
}

C++: #include <iostream>
using namespace std;
int i,a,b;

int main() {
	while(cin>>a>>b){
		a = a+b;
		string s = to_string(a);
		cout << s.size() << endl;
	}
	return 0;
}

C++: #include<iostream>
#include<stdio.h>
using namespace std;
int main(){
	int a,b,c,i;
	while(scanf("%d %d",&a,&b) != EOF){
		c = a + b;
		for(i = 0; c != 0; i++){
			c /= 10;
		}
		cout << i << endl;
	}
	return 0;
}

C++: #include<iostream>
#include<algorithm>
using namespace std;
int main (){
    int a[1000000],b[1000000];
    for(int i=0;i<200;i++){
        cin>>a[i]>>b[i];
        if(a[i]+b[i]<10){
        cout<<"1"<<endl;
        }
        else if(a[i]+b[i]<100){
        cout<<"2"<<endl;
        }
        else if(a[i]+b[i]<1000){
            cout<<"3"<<endl;
        }
        else if(a[i]+b[i]<10000){
            cout<<"4"<<endl;
        }
        else if(a[i]+b[i]<100000){
            cout<<"5"<<endl;
        }
        else if(a[i]+b[i]<1000000){
            cout<<"6"<<endl;
        }
    }
    return 0;
}

C++: #include <stdio.h>
int main(void){
	int a[11]={0},b,c,i,j;
	while(scanf("%d %d",&b,&c)!=EOF){
	printf("%d\n",b+c);
	}
}

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

int main()
{
    int a, b;
    while (1) {

        cin >> a >> b;
        if (a == 0 && b == 0)
            break;
        int c = a + b;
        int ans = 0;
        while (c != 0)
        {
            c /= 10;
            ans++;
        }
        cout << ans << endl;
    }
    return 0;
}

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

int main(void)
{
	int a, b, waru = 1, sum, count=0;

	while (cin >> a >> b)
	{
		count = 0;
		sum = a + b;
		while (sum != 0)
		{
			sum /= 10;
			count++;
		}
		cout << count << endl;;
	}
	return 0;
}

C++: #include <iostream>
#include <math.h>
using namespace std;



int main() {

//変数の宣言

	int a,b,sum,i=0;



/////メイン処理/////


	while(cin>>a>>b){ 
//入力
		sum = a + b;
//桁数の計算
	
		while(1){
			if (pow(10,i)<=sum && pow(10,i+1) > sum){
				cout << i+1 <<endl;
				break;
			}
			i++;
		}
		
		i = 0;
	}
	
	
	return 0;
}

C++: #include<cstdio>
using namespace std;
int main(){
	int a,b;
	while(scanf("%d %d",&a,&b)){
		char c[255];
		printf("%d\n",sprintf(c,"%d",a+b));
	}
	return 0;
}

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

using namespace std;

int main() {
	int a, b;
	while (scanf("%d%d", &a, &b) != EOF) {
		a += b, b = 0;
		while (a) ++b, a /= 10;
		printf ("%d\n", b); 
	}
	return 0;
}