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>

int main(){
	int a, b ,i ,n ;
	while(std::cin>>a>>b){
	i=1;
	for(n=1;a+b>=i*10;n++){
	if(a+b>=i*10){
	i=i*10;
	}
	}
	std::cout<<n<<std::endl;
}
return 0;
}

C++: #include<stdioi.h>
int main(void)
{
	int a,b,i,sum;
	
	while(scanf("%d %d",&a,&b)!=EOF) {
		sum=a+b;

		i=0;
		while(sum>0)	{
			sum=sum/10;
			i++;
		}
		printf("%d\n",i);
	}
	return 0;
}

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

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

C++: #include<stdio.h>

main(void){
    int i, n;
    
    scanf("%d", &n);
    int num[n][4];
    
    for( i = 0; i < n; i++){
        scanf("%d %d %d", &num[i][0], &num[i][1], &num[i][2]);
        if((num[i][2]*num[i][2]==num[i][0]*num[i][0]+num[i][1]*num[i][1])||(num[i][0]*num[i][0]==num[i][1]*num[i][1]+num[i][2]*num[i][2])||(num[i][1]*num[i][1]==num[i][0]*num[i][0]+num[i][2]*num[i][2])){
            num[i][3] = 1;
        }else{
            num[i][3] = 0;
        }
    }
    
    for( i = 0; i < n; i++){
        switch (num[i][3]){
            case 0:
            printf("NO\n");
            break;
            case 1:
            printf("YES\n");
            break;
        }
    }

    return 0;
}

C++: #include <stdio.h>

int main(void){
	int a,b;
	int sum;
	int loop_i,loop_j;
	int cnt=0;

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

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

int main(){
    long long a,b;
    cin >> a >> b;
    long long sum = a + b;
    string str = to_string(sum);
    cout << str.length()<<endl;
}

C++: #include <stdio.h>
main() {
  int a,b,cnt;
  while(scanf("%d %d",&a,&b)!=EOF) {
    cnt=1;
    a += b;
    while(a/=10,a>0) cnt++;
    printf("%d\n",cnt);
  }
  
}

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

int main() {
    int a, b, sum;
    while (cin >> a >> b) {
        int divisor = 10, digit = 1;
        sum = a + b;

        do {
            if ((sum / divisor) != 0) {
                digit++;
                divisor *= 10;
            }
            else if ((sum / divisor) == 0)
                break;
        } while (1);

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

C++: #include <iostream>
//#include <cstdio>
#include <cmath>
using namespace std;
 
//0002
int main(){
	int a, b, c;
	while(cin >> a >> b){
		c = a + b;
		cout << (int)log10(c);
	}
	return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
	int a[2];
	cin>>a[0];
	cin>>a[1];
	int sum=a[0]+a[1];
	int  i=0;
	while(1){
		i++;
	if(sum>=0&&9>=sum)break;
	sum/=10;
	}
	cout<< i<<endl;
	return 0;
}

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

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

auto main() -> int {
    int a, b;
    char str[100];
    while (std::cin >> a >> b) {
        std::sprintf(str, "%d", a+b);
        std::cout << strlen(str) << std::endl;
    }
}

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

using namespace std;

unsigned short digitsofnum(unsigned short n) {
	int j = 0;
	while (n > 0) {
		n = n / 10;
		j++;
	}
	return j;
}

int main()
{
	unsigned short a, b;
	vector<unsigned short> dst;
	while (cin >> a >> b)
		dst.push_back(digitsofnum(a + b));
	for (vector<unsigned short>::iterator it = dst.begin(); it < dst.end(); it++)
		cout << *it << endl;
	return 0;
}

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

using namespace std;
int data[10];

int main(){

int a,b;

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

cout<<ans<<endl;

}

}

C++: #include <stdio.h>

int main(void)
{
	int a, b;
	int add;
	int count;

	while (scanf("%d %d", &a, &b) != EOF){

		add = a + b;
	
		count = 0;
	
		while (add){
			add /= 10;

			count++;
		}

	printf("%d\n", count);
	}

	return (0);
}

C++: #include <iostream>
using namespace std;
int main(){
    int a,b,c;
    
    while(cin >> a >> b){
        int ans = 0;
        for(c = a + b;c!=0;ans++,c/=10);

        cout << ans << endl;
    }
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
#define FOR(i,x,n) for(int i=x; i<(n); i++)
#define ALL(n) begin(n),end(n)
#define MOD (1000000007)
#define INF (1e9)
#define INFL (1e18)
 
typedef long long ll;
typedef unsigned int ui;
typedef unsigned long long ull;
template<class T>using arr=vector<vector<T>>;
template<class T>void pr(T x){cout << x << endl;}
template<class T>void prvec(vector<T>& a){rep(i, a.size()-1){cout << a[i] << " ";} cout << a[a.size()-1] << endl;}
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
 
int main()
{
    int a, b;
    while(cin >> a >> b){
        int c = a + b;
        int ans = 0;
        while(c>0){
            ans++;
            c /= 10;
        }
        pr(ans);
    }
    return 0;}

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("more test.t") << endl;


return 0;
}

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

#define pb push_back
#define fr first
#define sc second
typedef pair<int,int> pii;
typedef vector<int> vi;
const int INF = (1<<25);
const int dx[]={1,0,-1,0},dy[]={0,-1,0,1};

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

C++: #include <iostream>

using namespace std;

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

C++: #include <iostream>

using namespace std;

void digit(int);

int main() {

	int a, b;

	while(1) {
		cin >> a >> b;
		digit(a);
	}

	return 0;

}

void digit(int a) {
	
	int i=0;
	while(a!=0) {
		a/=10;
		i++;
	}

	cout << i << endl;

}