Go: package main

import (
        "fmt"
        "os"
        "bufio"
        "strings"
        "strconv"
)

func main() {
        sc := bufio.NewScanner(os.Stdin)

        for sc.Scan() {
                digits := 0
                num := 0
                for _, s := range strings.Fields(sc.Text()) {
                        i, _ := strconv.Atoi(s)
                        num += i
                }
                for num > 0 {
                        digits += 1
                        num /= 10
                }
                fmt.Printf("%d\n", digits)
        }
}

C++: ///....................SUBRATO MOLLICK....................///
///.....DEPARTMENT OF COMPUTER SCIENCE AND ENGINEERING....///
///.............ISLAMIC UNIVERSITY,BANGLADESH.............///
///........................BETCH-10.......................///
#include <iostream>
using namespace std;
#define rep(i,n) for(__typeof(n) i=0; i<(n); i++)
#define REP2(i,n) for(__typeof(n) i=1; i<=(n); i++)
#define FOR(i,a,b) for(__typeof(b) i=(a); i<=(b); i++)
#define INF (1<<30)
#define PI 3.14159265358979323846264338327950
#define pb(x) push_back(x)
#define ALL(x) x.begin(),x.end()
#define SZ size()
#define eps 1e-9
#define VI vector<int>
#define VS vector<string>
#define LL long long
#define MII map<int,int>
#define MSI map<string,int>
#define MIS map<int,string>
#define CLEAR(x) memset(x,0,sizeof(x));
#define MAX(a,b) (a>b?a:b)
#define MIN(a,b) (a<b?a:b)
#define all(x) x.begin(),x.end()

/*long long c[201]={0};
bool p[205]={0};
void sieve()
{
   long long i,j;
    j=4;
     while(j<=201)
     {
         p[j]=1;
         j+=2;
     }
     long k=1;
     for(i=3;i<=(201);i+=2)
     {
        if(p[i]==0)
        {
            j=i;
            while(j+i<=201)
            {
                p[j+i]=1;j+=i;
            }
            if(p[i+2]==0)
            c[k++]=i;
        }
    }
}*/
/*long long npr(long n,long m)
{
   long long ret=1,i;
   for(i=1;i<=m;i++)
   ret*=(n-i+1);
   return ret;
}*/
/*long long ncr(long n,long m)
{
   long long ret=1,i;
   for(i=1;i<=m;i++)
   {
       ret*=(n-i+1);
       ret/=i;
   }
   return ret;
}*/
/*long long fact(long n)
{
    long long ret=1,i;
    for(i=1;i<=n;i++)
    ret*=i;
    return ret;
}*/
/*long long gcd(long n,long m)
{
  while(m>0)
  {
    n=n%m;
    n=n^m;
    m=m^n;
    n=n^m;
  }
  return n;
}*/
/*long long lcm(long n,long m)
{
    long long x=(n*m)/gcd(n,m);
    return x;
}*/
/*long is_prime(long n)
{
	long long ii;
	if(n == 1)
	return 0;
	if(n == 2)
	return 1;
	if(n%2 == 0)
	return 0;
	for(ii=3;ii*ii<=n;ii=ii+2)
        if(n%ii == 0)
        return 0;
        return 1;
}*/
/*double area_triangle(double x1,double y1,double x2,double y2,double x3,double y3)
{
    double a;
    a=x1*(y2-y3)+y1*(x3-x2)+((x2*y3)-(y2*x3))+eps;
    a=a/2+eps;
    return a;
}*/
/*double dist_2point(double x1,double y1,double x2,double y2)
{
    double d;
    d=sqrt(((x1-x2)*(x1-x2))+((y1-y2)*(y1-y2)));
    return d;
}*/
/*int binary_search(int a[],int n,int l,int u)
{
	int mid;
	if(l>u)
    return 0;
    mid=floor(l+u)/2;
    if(a[mid]==n)
    return mid;
    else if(a[mid]>n)
    binary_search(a,n,l,mid-1);
    else
    binary_search(a,n,mid+1,u);
}*/
/*bool is_palindrome(const string &s, int start, int end)
{
    int siz=end-start+1;
    if(siz%2==0)
    {
        int middle=start+siz/2;
        int i;
        for(i =0;middle-1-i>=0&&middle+i<=end&&s[middle-1-i]==s[middle+i];i++);
        if(middle-i-1<0||middle+i>end)
        return true;
    }
    else
    {
        int middle = start + siz/2;
        int i;
        for (i=1;middle-i>=0&&middle+i<=end&&s[middle-i]==s[middle+i];i++);
        if (middle-i<0||middle+i>end)
        return true;
    }
    return false;
}*/
int main()
{

    //freopen("Input.txt","r",stdin);
	//freopen("Output.txt","w",stdout);
	long n,m;
while(cin>>n>>m)
	{
	    long k=0;
	    n=n+m;
	    while(n!=0)
        {
            k++;
            n=n/10;
        }cout<<k<<endl;
    }
return 0;
}

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

int main(){
  vector<int> sum;
  vector<string> truss;
  int a,b;
  while(cin>>a>>b) {
 sum.push_back(a+b);
  }
  for(int i=0;i<(int)sum.size();i++) { 
    truss.push_back(to_string(sum[i]));
  cout<<truss[i].size()<<endl;
  }
  return 0;
}

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

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


using namespace std;

int main()
{
	
	int a,b;
	string input;
	int size[3];
	int i = 0;
	//cout << "input two numbers" << endl;
	for(i=0;i<3;i++){
	cin >> a >> b;
	b += a;
	input = to_string(b);
	size[i] = input.size();	
	
}
for(i=0;i < 3;i++){
	cout << size[i] << endl;
}

}

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

void main() {

	int a, b, c;
	char e[100];

	while (cin >> a >> b) {

		c = sprintf(e, "%d", a+b);

		cout << c << endl;
	}

	return 0;
}

C++: #include<stdio.h>
int main(){
	int x,y,i;
	for(i=0;i<=200;i++){
	scanf("%d %d",&x,&y);
	if((x+y)<10) printf("1\n");
	else if((x+y)<100) printf("2\n");
	else if((x+y)<1000) printf("3\n");
	else if((x+y)<10000) printf("4\n");
	else if((x+y)<100000) printf("5\n");
	else if((x+y)<1000000) printf("6\n");
	else printf("7\n");
	}
	return 0;
}

C++: #include <iostream>

using namespace std;

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

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

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

int main()
{

	while(true){
		int a,b,sum;
		int count = 0;
	
		cin >> a ;

		if(cin.eof())
			break;
		cin >> b;

		sum = a + b;

		for(int i=1 ;sum!=0 ;i++){

			sum /= 10;
			count = i;
		}

		cout << count << endl;
	}
		
		return 0;
}

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

int main(){
    int a,b;
    for(int i=0;i<200;++i){
        cin >> a >> b;
        cout << to_string(a+b).size() << endl;
    }
}

C++: #include <iostream>

using namespace std;

int main() {

	const int num=3;
	int a[num], b[num];

	for (int i = 0; i < num; i++) {
		cin >> a[i] >> b[i];
	}

	for (int i = 0; i < num; i++) {

		int sum = a[i] + b[i];
		int keta = 1;
		while (1) {
			if (sum >= 10) {
				keta++;
				sum /= 10;
			}
			else {
				break;
			}
		}

		cout << keta << endl;

	}

	return 0;

}

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

int main(){
	int a,b,c;
	int ans;
	bool flg;
	int cnt=-1;
	
	while(cin>>a>>b){
		cnt++;flg=false;
		//-----test-----
		switch(cnt){
		case 0:
			if(100000<a) flg=true; 
			break;
		}
		
		if(flg) break;
		
		//--------------
		c=a+b;
		ans=1;
		while(10<=c){
			c/=10;
			ans++;
		}
		cout<<ans<<endl;
	}
	
	return 0;
}

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

int digit(){
    int i = 0;
    int c = a + b;
    for(i = 0; c >= 1;i++){
        c = c/10;
    }
    return i;
}

int main() {
    while(cin>>a>>b){
        cout<< digit() <<endl;
    }
    return 0;
}

C++: #include <iostream>

using namespace std;

int main()
{
    int a;
    int b;
    int c;


    while(cin >> a >> b)
    {
        c = a+b;
        int digit=0;
        while (c>=1)
        {
            c = c/10;
            digit++;
        }

        cout << digit << endl;
    }



    return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
  int a,b,c;
  int d=0;
  cin >> a >> b;
  int c=a+b;
  while(c!=0){
    c=c/10;
    d=d+1;
  }
  cout << d << endl;
}

C++: import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        for (int i = 0; i < 200; i++) {
            int x1 =input.nextInt();
        int x2 =input.nextInt();
        int x3 = input.nextInt();
        String s1 = String.valueOf(x3);
        System.out.println(s1.length());
        }
    }
}