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 <bits/stdc++.h> // {{{

#define GET_MACRO(a, b, c, d, NAME, ...) NAME
#define REP(...) GET_MACRO(__VA_ARGS__, REP4, REP3, REP2)(__VA_ARGS__)
#define REP2(i, a) REP3(i, 0, a)
#define REP3(i, a, b) REP4(i, a, b, 1)
#define REP4(i, a, b, s) for (int i = (a); i < (int)(b); i += (s))
#define REPR(...) GET_MACRO(__VA_ARGS__, REPR4, REPR3, REPR2)(__VA_ARGS__)
#define REPR2(i, a) REPR3(i, 0, a)
#define REPR3(i, a, b) REPR4(i, a, b, 1)
#define REPR4(i, a, b, s) for (int i = (b)-1; i >= (int)(a); i -= (s))
#define ALL(c) (c).begin(), (c).end()
#define DUMP(x) (std::cerr << #x << ':' << ' ' << x << '\n')
#define TMPL_T template <typename T>
#define TMPL_TU template <typename T, typename U>
#define mut auto
#define let const auto

using Int = long long;
// clang-format off
namespace extio {
std::string delimiter=" ",pdelimiter=" ";
std::string bracket_b="",bracket_e="";
void chdelim(const std::string&s){delimiter=s;}
void chpdelim(const std::string&s){pdelimiter=s;}
void chbracket(const std::string&b,const std::string&e){bracket_b=b,bracket_e=e;}
TMPL_T  void pcont(std::ostream&os,const T&x){int c=0;for(const auto&a:x){if(c++)os<<delimiter;os<<a;}}
TMPL_TU void ppair(std::ostream&os,const std::pair<T,U>&p){os<<bracket_b<<p.first<<pdelimiter<<p.second<<bracket_e;}
}
namespace std {
TMPL_T ostream& operator<<(ostream&os,const vector<T>&x){extio::pcont(os,x);return os;}
TMPL_T ostream& operator<<(ostream&os,const set<T>&x){extio::pcont(os,x);return os;}
TMPL_T ostream& operator<<(ostream&os,const multiset<T>&x){extio::pcont(os,x);return os;}
TMPL_T ostream& operator<<(ostream&os,const deque<T>&x){extio::pcont(os,x);return os;}
TMPL_TU ostream& operator<<(ostream&os,const map<T,U>&x){extio::pcont(os,x);return os;}
TMPL_TU ostream& operator<<(ostream&os,const pair<T,U>&x){extio::ppair(os,x);return os;}
}
TMPL_TU inline bool chmax(T&x,U a){return x<a&&(x=a,1);}
TMPL_TU inline bool chmin(T&x,U a){return a<x&&(x=a,1);}

inline int in(){int x;std::cin>>x;return x;}

struct Initializer_ {
  Initializer_(){
    std::cin.tie(0);
    std::ios::sync_with_stdio(0);
    std::cout << std::setprecision(10);
    std::cerr << std::setprecision(10);
  }
} precalc;
// clang-format on
// }}}

using namespace std;

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

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

int digits(unsigned long p){
    if(p == 0) return 1;
    return (int)(log10l(p) + 1);
}

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

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

int main(){
	int a,b,c;
	int ans;
	
	string cunning="776755555555555555555555555555555555555554555555555555555555555555555555555555555555555555";
	
	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 <bits/stdc++.h>

using namespace std;

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

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++){
	i=i*10;
	}
	std::cout<<n<<std::endl;
}
return 0;
}

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

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

int main() {
    int a, b;

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

    return 0;
}

C++: #include <iostream>
#include <stdio.h>
#include <string>
using namespace std;
int main()
{
    int f,s;
    while (cin >> f >> s)
    {
        cout << to_string(f+s).length() << endl;
    }
}

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

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

using namespace std;

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

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

C++: #include<iostream>

using namespace std;

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

C++: #include <iostream>
#include <sstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <climits>
#include <cfloat>
using namespace std;

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

C++: 
//http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=0002&lang=jp

#include <algorithm>
#include <iostream>
#include <vector>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

using namespace std;

//テ」ツδ榲」ツつッテ」ツδュテ・ツョツ堙ァツセツゥ
#define ALL(v) (v).begin(),(v).end()
#define ARRAY_LENGTH(array) (sizeof(array) / sizeof(array[0]))
#define REP(i,a,b) for(int i=(int)(a); i<(int)(b); ++i)
#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define SORT(x) sort(begin(x),end(x))
#define SELECT_SORT(x, n) sort(begin(x),begin(x)+n)
#define SWAP(type, a, b) do {type tmp = a; a = b; b = tmp;} while (0)
#define rep_split(tok,a_str,re) for(char *tok = strtok((char *)a_str.c_str(),re); tok != NULL; tok = strtok(NULL,re))

//テ・ツョツ堙ヲツ閉ー
#define INF 2000000000000
#define MAX 10

//DEBUGテァツ板ィ
#define BAR() cout << "----------------------------" << endl;
#define DUMP(v) (cerr << #v << ": " << v << endl)
#define PRINT(list) cout << "{ "; for(auto nth : list){ cout << nth << " "; } cout << "}" << endl;


int main()
{
	int a=0;
	int b=0;
	while(cin >> a >> b)
	{
		int total = a + b;
		
		int i;
		if(total == 0){
			cout << i << endl;
		}else{
			for(i = 0; total != 0; i++){ total /= 10; }
			cout << i << endl;
		}
	}
	
}

C++: #include <iostream>

using namespace std;

int main()
{
	int a, b;

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

C++: #include<iostream>
using namespace std;
int main()
{
	while (true)
	{
		int a, b;
		cin >> a >> b;
		if (cin.fail())
			break;
		int cnt = 0;
		int x = a + b;
		do {
			x /= 10;
			cnt++;
		} while (x);
		cout << cnt << endl;
	}
}

C++: #include <iostream>
using namespace std;
int main( void )
{
  int x,y,z;
  while( 1 ){
    cin >> x >> y;
    if( cin.eof() ) break;
    x += y;
    z = 0;
    if( x == 0 ) z = 1;
    while( x > 0 ){
      z++;
      x /= 10;
    }
    cout << z << endl;
  }
  return 0;
}