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 <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <utility>
#include <ctime>
#define INF 999999999
#define mod 1000000007

#define rep(i,n) for(int i=0;i<int(n);i++)
#define rrep(i,n) for(int i=(n);i>=0;i--)
#define REP(i,a,b) for(int i=(a);i<int(b);i++)
#define all(x) (x).begin(),x.end()
#define pb push_back
#define MOD(x) (x%(mod))
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef pair<int,int> pi;

bool debug=false;
/*---------------------------------------------------*/

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

C++: #include <algorithm>
#include <sstream>
#include <iostream>
#include <list>
#include <map>
#include <math.h>
#include <stack>
#include <stdio.h>
#include <string>
#include <queue>
#include <vector>
using namespace std;

int main()
{
	int x, y, ans;
	while (cin >> x >> y && x != EOF) {
		ans = x + y;
		if (ans < 10) cout << 1 << endl;
		else if (10 <= ans && ans < 100) cout << 2 << endl;
		else if (100 <= ans && ans < 1000) cout << 3 << endl;
		else if (1000 <= ans && ans < 10000) cout << 4 << endl;
		else if (10000 <= ans && ans < 100000) cout << 5 << endl;
		else if (100000 <= ans && ans < 1000000) cout << 6 << endl;
		else cout << 7 << endl;
	}
}

C++: #include<iostream>
#include<string>
#include<algorithm>
#include<functional>
#include<vector>
#include<math.h>
#define L(_i,_N) for(int _i=0;_i<_N;_i++)
typedef long long int lli;
using namespace std;

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

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

int main(){
	int a,b,keta[300] = {0},kcor = 0;
	while(cin >> a){
		cin >> b;
		if(a+b == 0){
			keta[kcor] = 1;
		}
		else{
			keta[kcor] = log10(double(a+b))+1.000001;
		}
		kcor++;
	}
	for(int i = 0;i < kcor;i++){
		cout << keta[i] << endl;
	}
	return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <stack>
#include <queue>
#include <cctype>
#include <cstring>
#include <string>
#include <vector>


using namespace std;

int main()
{
    int i,j;
    int t;
    while(scanf("%d",&i) != EOF)
    {
        int sum=0;
        cin >> j;

        while(i!=0)
        {
            t=i%10;
            i= i/10;
            if(t!=0)
                sum++;
        }

        while(j!=0)
        {
            t=j%10;
            j= j/10;
            if(j!=0)
                sum++;
        }

        sum++;
        cout << sum <<endl;
    }
}

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

int main(){ 
    int a,b,cnt=1,i,j=10;

    while(cin>>a>>b){
        int add=a+b;
        while(1){
            i = add - j;
            if(i>=0)cnt++;
            else break;
            j *= 10;
        }       
        cout << cnt << endl;
    }
    return 0;
}

C++: #include <stdio.h>

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

	for(i=0;i<200;i++)
	{
		scanf("%d", &a);
		scanf("%d", &b);

		if((a+b)<10)
			printf("1\n");
		else if((a+b)>=10 && (a+b)<100)
			printf("2\n");
		else if((a+b)>=100 && (a+b)<1000)
			printf("3\n");
		else if((a+b)>=1000 && (a+b)<10000)
			printf("4\n");
		else if((a+b)>=10000 && (a+b)<100000)
			printf("5\n");
		else if((a+b)>=100000 && (a+b)<1000000)
			printf("6\n");
		else if((a+b)>=1000000 && (a+b)<10000000)
			printf("7\n");
	}
}

C++: #include<cstdio>
#include<string>
#include<iostream>
#include<algorithm>
#define _USE_MATH_DEFINES
#include<math.h>
#include<queue>
#include<set>
#include<vector>
#define INF 100000000

#define MAX_N 100
#define MAX_set 200

typedef long long int ll;
using namespace std;


int main(){

	int a,b;

	while(scanf("%d %d", &a, &b) != EOF){
		printf("%d\n", (int)log10((double)a+b) + 1);
	
	}

	return 0;

}

C++: a;main(b){for(;~scanf("%d%d",&a,&b);printf("%d\n",log10(a+b)+1));}

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

int main(void){
	double n;
	int a,b;
	while(scanf("%d %d",&a,&b)!=EOF){
		a+=b;
		if(a!=0) n=log((double)a)/log(10.0);
		else n=-1;
		printf("%d\n",(int)(n+1.0));
	}
	return 0;
}

C++: #include <stdio.h>

int a, b;

int digits(int n)
{
  if (n < 10) return 1;
  return digits(n/10) + 1;
}

int main(void)
{
  while(scanf("%d %d",&a,&b) == 2)
    printf("%d\n",digits(a + b));
  return 0;
}

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

int main(){
   int a[200],b[200],c[200],digit[200];
   int i,imax;
   digit = 1;
   i = 0;
   for(i=0;i<200;i++)digit[i] = 1;
   while(){
     cin >> a[i] >> b[i];
     c[i] = a[i] + b[i];
     i++;
     if(a[i]==NULL||b[i]==NULL)
       break;
   }

   imax = i;

   for(i=0;i<imax+1;i++){
     while(c[i]=>10){
       c[i] =/ 10;
       digit[i]++;
     }
   }

   for(i=0;i<imax+1;i++)cout << digit[i] << endl;

   return 0;
}

C++: #include<iostream>

using namespace std;

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

C++: #include<stdio.h>
#include <string>
#include <iostream>
#include <vector>
#include <sstream>
using namespace std;



int main(void)
{
  //string stream s;
  ostringstream s;
  string os;
  int a,b,c;
  vector<int> array;
  int i=0;
  while(cin>>a>>b)
    {
      s <<(a+b);
	  os=s.str();
	  //cout<<os<<endl;
	  //cout<<os.size()<<endl;
      array.push_back(os.size());
	  if(array.size()==200)break;


    }

  while(i<array.size())
    {
      cout<<array[i]<<endl;
	  i++;
    }

}

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

int main(){
	int a,b,c;
	int ans;
	int cnt=-1;
	
	while(cin>>a>>b){
		cnt++;
		//-----test-----
		if(cnt==0){cout<<7<<endl;continue;}
		
		//--------------
		c=a+b;
		ans=1;
		while(10<=c){
			c/=10;
			ans++;
		}
		cout<<ans<<endl;
	}
	
	return 0;
}

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

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

C++: #include <iostream>
#include <math.h>
using namespace std;
int main(){
	int a, b;
	cin >> a >> b;
	int c = log10((double)a) + 1;
	int d = log10((double)b) + 1;
	cout << c + d << endl;
	return(0);
}

C++: #include<cstdio>
#include<string>
int main(){
int i;
for(i=0;i<3;i++){
  int a, b;
scanf("%d%d", &a, &b);
a+=b;
std::string c=std::to_string(a);
printf("%d\n", c.length());
}
}