Go: package main

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

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	a := make([]float64, 10)
	for scanner.Scan() {
		info := strings.Split(scanner.Text(), ",")
		for j := 0; j < 10; j++ {
			a[j], _ = strconv.ParseFloat(info[j], 64)
		}
		v1, _ := strconv.ParseFloat(info[10], 64)
		v2, _ := strconv.ParseFloat(info[11], 64)
		sum := 0.0
		for i := 0; i < 10; i++ {
			sum += a[i]
		}
		match := v1 * ((sum/(v1+v2)))
		if match == 0 {
			fmt.Println(1)
		} else {
			sum = 0
			for k := 0; k < 10; k++ {
				sum += a[k]
				if match <= sum {
					fmt.Println(k+1)
					break
				}
			}
		}
	}
}

C++: #define _USE_MATH_DEFINES
#include<iostream>
#include<string>
#include<queue>
#include<cmath>
#include<map>
#include<set>
#include<list>
#include<iomanip>
#include<vector>
#include<random>
#include<functional>
#include<algorithm>
#include<stack>
#include<cstdio>
#include<bitset>
#include<unordered_map>
#include<climits>
#include<fstream>
using namespace std;
///////////////////library zone!!!!!!!!!!!!!!!!!!!!!!!!!!!!
typedef long long ll;
typedef long double ld;
#define all(a) (a).begin(),(a).end()
#define EPS (1e-7)
const ll Mod = 1000000007;
const ll mod = 998244353;
struct H {
	ll x, y;
	bool operator<(const H &b) const {
		if (x != b.x) return x < b.x;
		return y < b.y;
	}
	bool operator>(const H &b) const {
		if (x != b.x) return x > b.x;
		return y > b.y;
	}
	bool operator==(const H &b) const { return x == b.x&&y == b.y; }
	bool operator!=(const H &b) const { return (*this) != b; }
};
struct P {
	ll pos, cost;
	bool operator<(const P &b) const { return cost < b.cost; }
	bool operator>(const P &b) const { return cost > b.cost; }
};
struct B {
	ll to, cost;
};
struct E {
	ll from, to, cost;
	bool operator<(const E &b) const { return cost < b.cost; }
	bool operator>(const E &b) const { return cost > b.cost; }
};
template<typename T, typename U>
void chmin(T &a, U b) {
	if (a > b) a = b;
}
template<typename T, typename U>
void chmax(T &a, U b) {
	if (a < b) a = b;
}
template<typename T>
T max_0(T a) {
	if (a < 0) return 0;
	return a;
}
template<typename T>
T min_0(T a) {
	if (a > 0) return 0;
	return a;
}
ll read() {
	ll u;
	ll k = scanf("%lld", &u);
	return u;
}
ll gcd(ll i, ll j) {
	if (i > j) swap(i, j);
	if (i == 0) return j;
	return gcd(j%i, i);
}
ll mod_pow(ll x, ll n, ll p) {
	ll res = 1;
	while (n > 0) {
		if (n & 1) res = res * x % p;
		x = x * x % p;
		n >>= 1;
	}
	return res;
}//x^n%p
vector<string>split(string s, char c = ' ') {
	vector<string>vec;
	string h = "";
	for (int i = 0; i < s.size();) {
		int j = i;
		while (j < s.size() && s[j] != ' ') {
			h += s[j++];
		}
		if (h.size() > 0) vec.push_back(h);
		h = "";
		i = j + 1;
	}
	return vec;
}
template<typename T>
void print_vec(vector<T>a) {
	for (int i = 0; i < a.size(); i++) {
		cout << (i == 0 ? "" : " ") << a[i];
	}
	cout << endl;
}
const ll Inf = 3023372036854775807;
const int inf = 1500000000;
#define int long long
//----------------------------------------------------
class Vec2 {
public:
	ld x, y;
	Vec2() { x = 0, y = 0; }
	Vec2(ld x, ld y) :x(x), y(y) {}
	ld length() {
		return sqrt(x*x + y * y);
	}
	Vec2 normal() {
		ld len = this->length();
		if (len == 0) return Vec2(x, y);
		x /= len, y /= len;
		return *(this);
	}
	Vec2 operator+(Vec2 vec) {
		return Vec2(x + vec.x, y + vec.y);
	}
	Vec2 operator-(Vec2 vec) {
		return Vec2(x - vec.x, y - vec.y);
	}
	template<typename T>
	Vec2 operator*(T cons) {
		return Vec2(x*cons, y*cons);
	}
	ld operator*(Vec2 vec) {
		return x * vec.x + y * vec.y;
	}
	ld operator%(Vec2 vec) {
		return x * vec.y - y * vec.x;
	}
	bool operator==(Vec2 vec) {
		return abs(x - vec.x) < EPS && abs(y - vec.y) < EPS;
	}
};
ld dot(Vec2 a, Vec2 b) {
	return a.x*b.x + a.y*b.y;
}
ld cross(Vec2 a, Vec2 b) {
	return a.x*b.y - a.y*b.x;
}
ld areaIntegral(Vec2 a, Vec2 b) {
	return abs(a.x*b.y - a.y*b.x) / 2.0;
}
class Vec3 {
public:
	ld x, y, z;
	Vec3() { x = 0, y = 0, z = 0; }
	Vec3(ld x, ld y, ld z) :x(x), y(y), z(z) {}
	ld length() {
		return sqrt(x*x + y * y + z * z);
	}
	void normal() {
		ld len = this->length();
		if (len == 0) return;
		x /= len, y /= len, z /= len;
	}
	Vec3 operator+(Vec3 vec) {
		return Vec3(x + vec.x, y + vec.y, z + vec.z);
	}
	Vec3 operator-(Vec3 vec) {
		return Vec3(x - vec.x, y - vec.y, z - vec.z);
	}
	Vec3 operator*(int cons) {
		return Vec3(x*cons, y*cons, z*cons);
	}
	ld operator*(Vec3 vec) {
		return x * vec.x + y * vec.y + z * vec.z;
	}
};
ld dot(Vec3 a, Vec3 b) {
	return a.x*b.x + a.y*b.y + a.z*b.z;
}
class Line {
public:
	Vec2 from, to;
	Line(Vec2 from, Vec2 to) :from(from), to(to) {}
};
Line getPerpendicularBisector(Line line) {
	int cx = (line.from.x + line.to.x) / 2, cy = (line.from.y + line.to.y) / 2;
	Vec2 p = Vec2(cx + (line.from.y - line.to.y), cy + (line.to.x - line.from.x));
	return Line(Vec2(cx, cy), p);
}
signed main() {
	int l[10], u, v;
	while (~scanf("%lld,%lld,%lld,%lld,%lld,%lld,%lld,%lld,%lld,%lld,%lld,%lld", &l[0], &l[1], &l[2], &l[3], &l[4], &l[5], &l[6], &l[7], &l[8], &l[9], &u, &v)) {
		int sum = 0;
		for (int i = 0; i < 10; i++) sum += l[i];
		ld t = (ld)sum * (ld)u / (ld)(u + v);
		sum = 0;
		for (int i = 0; i < 10; i++) {
			sum += l[i];
			if (t <= sum) {
				cout << i + 1 << endl;
				goto loop;
			}
		}
	loop:;
	}
}

C++: #include <iostream>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <bitset>
#include <algorithm>
#include <numeric>
#include <utility>
#include <sstream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <string>
#include <cstring>
#include <climits>
 
#define REP(i,b,n) for(int i=b;i<n;++i)
#define REPR(i,b,n) for(int i=n-1;i>=b;--i)
#define CLR(mat) memset(mat, 0, sizeof(mat))
#define NCLR(mat) memset(mat, -1, sizeof(mat))
#define EACH(i, c) for(typeof((c).begin()) i = (c).begin(); i != (c).end(); ++i)
#define EXIST(s, e) ((s).find(e) != (s).end())
#define BIT(n, b) ((n>>b) & 1)
#define PI acos(-1.0)

using namespace std;

static const double EPS = 1e-9;
typedef pair<int, int> pii;
typedef long long ll;

double l[11]={0}, v1, v2;

int solve(){
	
	double r = v1/(v1+v2);
	double x = r*l[10];
	
	for(int i=1; i <= 10; ++i){
		if( x <= l[i] )
			return i;
	}
	
	return 10;
}
	

int main(){
	
	char c;
	
	while(cin>>l[1]>>c>>l[2]>>c>>l[3]>>c>>l[4]>>c>>l[5]>>c>>
			l[6]>>c>>l[7]>>c>>l[8]>>c>>l[9]>>c>>l[10]>>c>>v1>>c>>v2, !cin.eof()){
		
		for(int i=1; i<=10; ++i){
		
			l[i]+=l[i-1];
		}
		
		cout << solve() << endl;
	}
		
	return 0;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
#include<map>
#include<set>
#include<utility>
#include<vector>
#include<cmath>
#include<cstring>
#include<cstdio>
#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)
#define rp(a) while(a--)
#define pb push_back
#define mp make_pair
#define all(in) in.begin(),in.end()
const double PI=acos(-1);
const double EPS=1e-10;
using namespace std;
typedef long long ll;
typedef vector<int> vi;
int main(){
	char d;
	vector<int>in(10);
	while(cin>>in[0]){
		in[0]*=10000;
		int sum=in[0];
		rep(i,9){
			cin>>d>>in[i+1];
			in[i+1]*=10000;
			sum+=in[i+1];
		}
		int v1,v2;
		cin>>d>>v1>>d>>v2;
		int dis=sum/(v1+v2)*v1;
		bool h=false;
		if(sum%(v1+v2)==0)h=true;
		int sum2=0;
		rep(i,10){
			sum2+=in[i];
			if(sum2>=dis){
				cout<<i+1<<endl;
				break;
			}
		}
	}
}

C++: #include<cstdio>
#include<algorithm>
#include<numeric>
using namespace std;
int main(){
  int l[10], v1, v2, ret;
  while(~scanf("%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",&l[0],&l[1],&l[2],&l[3],&l[4],&l[5],&l[6],&l[7],&l[8],&l[9],&v1,&v2)){
    int sum = accumulate( l, l + 10, 0), k = 0;
    double ret = ((double)v1 / ( v1 + v2)) * sum;
    for(int i = 0 ; i < 10 ; i++ ){
      if( (k += l[i]) >= ret ){
        printf("%d\n", i+1);
        break;
      }
    }
  }
}