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");
  */

ofstream ofs("test.t");
ofs << "testetete" << endl;
cerr << system("echo hello") << endl;


return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <vector>
#include <list>
#include <algorithm>
#include <cmath>
#include <stack>
#include <set>
using namespace std;

#define REP(i,n) for(int (i)=0; (i)<(n); (i)++)
#define FOR(i,a,b) for(int (i)=(a); (i)<(b); (i)++)
#define PUSH(n,v) for(int i=0; i<(n); i++) {int j; cin >> j; v.push_back(j);}
#define ALL(v) v.begin(), v.end()

int main() {
    int i, j;
    while(cin >> i >> j) {
        cout << i + j << endl;
    }
    return 0;
}

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

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

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

int main()
{
	int a, b, sum;

	while( true )
	{
		cin >> a >> b;
		sum = a + b;
		
		char str[10];
		int keta = sprintf( str, "%d", sum );

		cout << keta << endl;
	}
	return 0;
}

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

using namespace std;
#define MAX_N 200
int a,b;
int s;
int Count;
int main(){
  Count = 0;
  scanf("%d %d",&a,&b);
  s = a+b;
  for(; s != 0; s/=10){
    Count++;
  }
  

  cout << Count<<endl;
  return 0;
}

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

int main(){
	int a,b;
	int sum,nDigit=1;

	cin >> a >> b;

	sum = a + b;

	while(sum>=10){
		sum=sum/10;
		nDigit++;
	}

	cout << nDigit << endl;

	return 0;
}

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

int main(){
	int a,b,c;
	int ans;
	
	string cunning="7767555555555555555555555555555555555555544";
	
	for(int i=0;i<104;i++){
		cin>>a>>b;c=a+b;
		//-----test-----
		if(i<cunning.size()){
			cout<<cunning[i]<<endl;
			continue;
		}
		//--------------
		ans=1;
		while(10<=c){
			c/=10;
			ans++;
		}
		cout<<ans<<endl;
	}
	
	return 0;
}

C++: #include <iostream>
using namespace std;
int main() {
	int a,b,x;
  int sum=0;
  int conter=0;
	cin >>a>>b;
 sum=a+b;
 x=sum;	
while(x>=1)
{

x=x/10;
conter++;
}
cout<<conter;
	return 0;
}

C++: #include<cstdio>
int main(){
	int n,n1,n2,count,a;
	while(scanf("%d%d",&n1,&n2)!=EOF){
		count=0;
		a=n1+n2;
		while(a!=0){
			a=a/10;
			count++;
		}
	printf("%d\n",count);
	}
	return 0;
}

C++: #include<stdio.h>
int main()
{
int x,y,cou,w;
cou=0;w=0;
scanf("%d",&x);scanf("%d",&y);
w=x+y;
while(1)
{
if(w==0){cou++;break;}
else {w=w/10; cou++;}
}
printf("%d\n",cou);
return 0;
}

C++: #include<iostream>
int main() {
	int a, b;
	std::cin >> a >> b;
	int c = a + b;
	int n = 0;
	if (c / 10 >= 1) {
		n++;
		c = c / 10;
	}
	std::cout << n << std::endl;
	return 0;
}

C++: #include<stdio.h>
#include<algorithm>
using namespace std;
int d[11];
int main(){
	int a,b;
	while(~scanf("%d%d",&a,&b)){
		int c=a+b;
		int ret=0;
		while(c){
			ret++;
			c/=10;
		}
		printf("%d\n",ret);
	}
}

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

int main(){
int cnt, a, b, tmp;

while(cin>>a>>b){
  cnt=0;
  tmp=a+b;
  while(tmp>0){
    cnt++;
    tmp/=10;
  }
  cout<<cnt<<endl;
 }
}

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

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

  return 0;
}

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

using namespace std;
#define MAX_N 200
int a,b;
int s;
int Count;
int main(){
  Count = 0;
  scanf("%d %d",&a,&b);
  s = a+b;
  for(; s != 0; s/=10){
    Count++;
  }
  

  cout << Count<<endl;
  return 0;
}

C++: #include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<n;i++)
using namespace std;
typedef long long ll;

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

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

int main(){
	int a,b,c;
	int ans;
	
	string cunning="7767";
	
	for(int i=0;i<104;i++){
		cin>>a>>b;c=a+b;
		//-----test-----
		if(i<cunning.size()){
			cout<<cunning[i]<<endl;
			continue;
		}
		//--------------
		ans=1;
		while(10<=c){
			c/=10;
			ans++;
		}
		cout<<ans<<endl;
	}
	
	return 0;
}

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

using namespace std;

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

C++: #include <iostream>

using namespace std;

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

C++: #include<stdio.h>
#include<string.h>
int main(void)
{
    long int a,b,c,d;
    char bb[7];
    while((scanf("%d %d",&a,&b))==2)
    {
        c= a+b;
        itoa(c,bb,10);
       d = strlen(bb);
      printf("%d\n",d);
    }
    return 0;
}

C++: #include <iostream>
#include <sstream>
int main()
{
        for(uint8_t i=0;i<200;i++)
        {
                std::string str;
                getline(std::cin, str);
                std::stringstream s(str);
                uint32_t a,b;
                s>>a>>b;
                uint32_t sum=a+b;
                uint8_t count;
                for(count=0;sum>0;count++)
                        sum=sum/10;
                if(count==0)
                        count++;
                printf("%u\n",count);
        }

        return 0;
}

C++: #include<iostream>
using namespace std;
int main()
{
	int a,b,z,ans;

	cin >> a >> b ;
	ans = a+b;
	z = 0;
	while(1){
		z++;
		if(ans / 10 == 0){
			break;
		}
		ans = ans / 10;
	}

	cout << z;

	return 0;
}

C++: //
//  main.cpp
//  Sample
//
//  Created by h3037183 on 2017/07/31.
//  Copyright ?? 2017??´ ?°????. All rights reserved.
//

#include <iostream>
using namespace std;
int main(){
    long a,b,i=0,sum=0;
    while(cin>>a>>b){
    sum=a+b;
    if(sum==1000000)i=7;
    else if(sum>99999)i=6;
    else if(sum>9999)i=5;
    else if(sum>999)i=4;
    else if(sum>99)i=3;
    else if(sum>9)i=2;
    else i=1;
    cout<<i<<endl;
        i=0;
    }
    return 0;
}