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#include <iostream>
#include <cstdio>
#include <cstring>
#include <cctype>
#include <algorithm>
#include <vector>
#include <string>
#include <stack>
#include <queue>
#define For(a,x,y) for (int a = x; a <= y; ++a)
#define Bak(a,y,x) for (int a = y; a >= x; --a)
using namespace std;
namespace FastIO {
void DEBUG(char comment[], int x) {
cerr << comment << x << endl;
}
inline int getint() {
int s = 0, x = 1;
char ch = getchar();
while (!isdigit(ch)) {
if (ch == '-') x = -1;
ch = getchar();
}
while (isdigit(ch)) {
s = s * 10 + ch - '0';
ch = getchar();
}
return s * x;
}
inline void __basic_putint(int x) {
if (x < 0) {
x = -x;
putchar('-');
}
if (x >= 10) __basic_putint(x / 10);
putchar(x % 10 + '0');
}
inline void putint(int x, char external) {
__basic_putint(x);
putchar(external);
}
}
namespace Solution {
}
int main(int argc, char *const argv[]) {
#ifndef HANDWER_FILE
freopen("coin.in", "r", stdin);
freopen("coin.out", "w", stdout);
#endif
int t;
cin >> t;
char c;
int x = 0, X = 0;
while (t --> 0) {
cin >> c;
switch(c) {
case 'x' :
++x;
break;
case 'X' :
++X;
break;
}
}
if (x == X) {
puts("0");
return 0;
}
int cnt = 0;
if (x < X) {
while (x != X) {
++x, --X, ++cnt;
}
}
if (X < x) {
while (x != X) {
++X, --x, ++cnt;
}
}
FastIO::putint(cnt, '\n');
return 0;
}
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