import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.Arrays;

class Solution042 {

public int findContentChildren(int[] g, int[] s) {

int g0 = 0;

int s0 = 0;

//先对两个数组排序，g是胃口大小数组，s是饼干大小数组

Arrays.sort(g);

Arrays.sort(s);

if( g == null|| s == null) return 0;

//这里循环的条件是两个指针不达到两个数组的长度，也就是没有元素移动了

while(g0<g.length && s0<s.length){

if(g[g0]<=s[s0]){

//当胃口比饼干小，那么匹配成功，分给小孩

g0++;

}

s0++;

}

return g0;

}

}

public class assignCookies {

public static int[] stringToIntegerArray(String input) {

input = input.trim();

input = input.substring(1, input.length() - 1);

if (input.length() == 0) {

return new int[0];

}

String[] parts = input.split(",");

int[] output = new int[parts.length];

for(int index = 0; index < parts.length; index++) {

String part = parts[index].trim();

output[index] = Integer.parseInt(part);

}

return output;

}

public static void main(String[] args) throws IOException {

BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

String line;

while ((line = in.readLine()) != null) {

int[] g = stringToIntegerArray(line);

line = in.readLine();

int[] s = stringToIntegerArray(line);

int ret = new Solution042().findContentChildren(g, s);

String out = String.valueOf(ret);

System.out.print(out);

}

}

}