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 <cstdio>
#include <cstring>

int main()
{
	int a, b;
	while (scanf("%d %d", &a, &b) != EOF)
	{
		int s = a+b;
		int ans = 1;
		while (s > 9)
		{
			s /= 10;
			++ans;
		}
		printf("%d\n", ans);
	}

	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define REP(i,n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define REPR(i,n) for(int i=n; i>-1; --i)
#define ALL(a) (a).begin(),(a).end()
#define FILL(a,x); REP(i,sizeof(a)){ (a)[i]=(x); }
#define CINA(a,n); REP(i,(n)){ cin >> (a)[i]; }
#define FILL2(a,n,m,x); REP(i,(n)){ REP(j,(m)){(a)[i][j]=(x);} }
#define CINA2(a,n,m); REP(i,(n)){ REP(j,(m)){cin >> (a)[i][j];} }
#define Liny "Yes\n"
#define Linn "No\n"
#define LINY "YES\n"
#define LINN "NO\n"

#define umap unordered_map
//cout << setfill('0') << right << setw(4) << 12; // "0012"
int keta(ll x){ if(x<10){return 1;} else{return keta(x/10) + 1;}}
int keta_wa(ll x){ if(x<10){return x;} else{return keta_wa(x/10) + x%10;} }
int ctoi(char c){ return ( (c>='0' && c<='9')? c - '0': 0 );}
ll sum(ll a[],ll N){ return accumulate(a,a+N,0LL);}
ll gcd(ll a,ll b){if(a<b)swap(a,b); return b?gcd(b,a%b):a;}
ll lcm(ll a,ll b){if(a<b){swap(a,b);} return a/gcd(a,b)*b;}

int main(){
  int a,b;
  while(cin>>a>>b){
    cout << keta(a+b) <<"\n";
  }
}

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

using namespace std;

int main(void){

 int a,b;
 int sum;
 int ans;

 while(1){
  cin >> a >> b;
  sum=a+b;
  ans=log10(sum)+1;

  cout << ans << endl;
 }
}

C++: #include<stdio.h>
int main()
{
    long int a,b,sum,temp,i=0,j=0;
    while (scanf("%ld%ld",&a,&b)==2)
    {
        while(a!=0)
        {
            temp=a%10;
            a=a/10;
            if(temp!=0)
            {
                i++;
            }
        }
        while(b!=0)
        {
            temp=b%10;
            b=b/10;
            if(temp!=0)
            {
                j++;
            }
        }
        sum=i+j;
        printf("%ld\n",sum);
    }
    return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;

int main(){
    int a,b;
    while(scanf("%d %d",&a,&b) != EOF){
        int sum = a + b, cnt = (sum == 0 ? 1 : 0);
        while(sum > 0){
            sum /= 10;
            cnt++;
        }
        cout << cnt << endl;
    }

    return 0;
}

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

int main() {
	int a,b;
	while(true){
	cin >> a;
	if(cin.eof())
		break;
	cin >> b;
	a = a+b;
	int digit=1;
	while(true){
		if(a < 10^digit )
			break;
		else
			digit++;	
	}
	cout << digit << endl;
	
	}
	return 0;

}

C++: #include<iostream>

using namespace std;

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

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

int main()
{
  int a, b;
  int cou;
  int i, j;
  int ten;

  for (i = 0; i < 200; i++){
    cou = 0;
    ten = 1;
    cin >> a >> b;
    a += b;
    for (j = 1; j <= 7; j++){
      if (a / ten > 0){
        cou++;
        ten  *= 10;
      }
    }
    cout << cou << "\n";
  }

  return (0);
}

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

using namespace std;

int main()
{
    string ans;
    int a, b;

    while (cin >> a >> b)
    {
        cout << to_string(a + b).length() << endl;
    }
}

C++: #include <iostream>

using namespace std;

int main ( void )
{
  int a, b;
  while (cin >> a >> b)
  {
    int c = a + b, digit = 0;

    do
    {
      c /= 10;
      ++digit;
    } while (c);

    cout << digit << endl;
  }
  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
 
int main() {
  int n1,n2,total;
  while ( cin >> n1 >> n2 ) {
    total = n1 + n2;
    int n = 0;
    while (1) {
      if ( total < 1 ) break;
      total /= 10;
      n++;
    }
    cout << n << endl;
  }
  return 0;
}

C++: #include <bits/stdc++.h>

using namespace std;

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

C++: #include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <stack>
#include <map>
#include <algorithm>
#include <sstream>
#include <cmath>
#include <set>
#include <cstdio>

using namespace std;

#define REP(i,n) for(int (i)=0;(i)<(int)(n);(i)++)
#define RREP(i,n) for(int (i)=(int)(n)-1;(i)>=0;(i)--)
#define REMOVE(Itr,n) (Itr).erase(remove((Itr).begin(),(Itr).end(),n),(Itr).end())
#define PB_VEC(Itr1,Itr2) (Itr1).insert((Itr1).end(),(Itr2).begin(),(Itr2).end())
#define UNIQUE(Itr) sort((Itr).begin(),(Itr).end()); (Itr).erase(unique((Itr).begin(),(Itr).end()),(Itr).end())

typedef long long ll;

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

C++: #include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
using namespace std;
typedef long long ll;
typedef vector<int> vint;
typedef pair<int, int> pint;
#define MOD 1000000007 //10^9+7
#define INF 1000000000 //10^9

int main (int argc, const char * argv[])
{
    double a,b;
    while(1){
        cin>>a>>b;
        if (a==0&&b==0) return 0;
        int k=log10(a+b)+1;
        cout<<k;
    }
}

C++: #include<stdio.h>
 
int main(void){
int a, b, c, i;
 
while(scanf("%d %d", &a, &b) != EOF){
c = a + b;
for( i=0; c != 0;i++)
c /= 10;
printf("%d\n", i);
}
return 0;
}

C++: #include <iostream>

using namespace std;

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

int main()
{
	solve();
	return(0);
}

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

int main()
{
        string input;
        string hoge;
        string fuga;
        string piyo;
        long first, second;
        int size = 0;
        int i;
        long sum = 0;
        double sep = 0;

        cout << "input two numbers" << endl;
        cin >> input;
        size = input.size();
        i = input.find(" ");
        hoge = input.substr(0,i - 1);
        fuga = input.substr(i + 1);
        first = stoi(hoge);
        second = stoi(fuga);
        sum = first + second;
        piyo = to_string(sum);
        size = piyo.size();
        cout << size << endl;
}
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