/*                    `
                                    `.:ossyyyyysssssyyyyyyhyyyhyyyyysssooo+//:-.```
                                   -sdNNMMMMMMNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNmmdhhyso+/-.``
                                  `odNNNmmdhysoo+//////::::::::::::://///+ooosyyhhdmmmNmmhs+:-.`
                                   .--:/oo+:```                           ``````...--:/oshdmmmdyo/-`
                                   `.:oymd+.                                            ``-:/ohdNNmhs/-.`
                                `./ydNNNh:`                                                  `.:+ydNNNmdy+:.`
                              `-ohNMMNho-`                                                       `-/oydNMNmdyo/-`
                            `:smNMMNdo-`                                                            ``-/oydmNNNmhs/.`
                           .odNMMNh+-`                                                                   `-/+shmNNmdyo:.`
                         `:hNMNmy/.`                                                                         `.-+ydNNNNdo:.`
                        `+dNMmy/.                                                                               `.-/shNMNmhs:.
                       .+mMNh/.                                                                                     `./shNMMmh+-`
                      .oNMNo.                                                                                          `./ymNMNdo-`
                     `+mMms.                                                                                              .:odNMNmo-`
                     -hNNy-                                                                                                 `-odNMNdo-
                    `sNMd+`                                                                                                   `:smMMNh+.
                   `:mMNy-                                                                                                      `/hmMMNh/`
                   .hNMNs.                                                                                                        .+dNMMms-`
                   -mMMmo`                                                                                                         `-smNMNd+.
                  `/NMMd/                                                                `.-://:-..`                                 ./hNMMNy:`
                  .sNMMh/                                                              `:oddddmmmmhs:`                                `.odNMMmo.
                  -hNMMy-                                                             `:hNMh/-:/yNMNd+`                                 `-omMMNh:`
                  -dMMMy-                        `-::::.``                            .sNMMmy+:/ymMMm+`                                   `/hNMMm+.
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                 `/mMMMs.                    `:hNMMNNMMMMMh:                          `-+syhhyyyyyys/`                                       `:yNMMd/`
                 `+NMMMs.                    -yNMNy::ohNMMd/`                             `````````                                            .odNMmo.
                 .oNMMMs.                    :dNMNy/:+hNMMd/                                                                                    `/hNMNh:`
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                .sNMMNo.                                                                                                                              `smMm/`
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                `+NMNy-                                                                                                                                   `/mMNs.                                                                     `.-..//.
                 /dMNd:`                                                                                                                                  `:dNMy:                                                                     .odhs/.
                 -yMMm+`                                                                                                                                  `:dMMd/                                                                      .--``
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                     `+mMMNy-`                                     `-....````                            `````````                                        `:dMMMy.                         .::/+o+:.   -+ooosssooo:`  `-/oo+:.`         -+ssso:.+ssso:./ssso/` `.:+oo+:`    `.:/oo+:.
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                             `+dNMms-`                                                                                                                   -yMMMd:                           `.:/oo+/-`    ./sddyo:`   ./oooo+/-`         -+ydhsoooydhsoooyddh+.`/syo/-:sy+.` ./shhyo:`
                               -omMNh/`                                                                                                                 `+mMMN+`                              ````        ```````       ````             `````````````````-/o-  ```   ``      ````
                                `:hNMms-`                                                                                                               :yMMNy-                                                                                            `-`
                                  .odMNh/`                                                                                                             .omMNh-`
                                   `/hNMmo.`                                                                                                          `+dMNd:`
                                     -smMNh+.                                                                                                        `+dMMd/`
                                      .+mMMNh+.`                                                                                                    .+dNNh/`
                                       .oNMMMmhs:.`                                                                                                .odNNs-                                      `..-----`
                                        .shdmNMNNho/-``                                                                                          ./hNNd+.                                     -+syyyyso:`
                                         ``.-/ohmNNmdyo:.`                                                                                    `.:smNms-`                                    `-++:-...``
                                              ``-/shNNNmho/-`                                                                              `.:ohmNms:`                                      ./-``````     ```````    ```````  ```````.````     `````
                                                  `.:sdNNNNdy+-``                                                                       `.:ohmNNms:`                                       `:/-:/+ooo/.` ./shhs+-   `:oydho-``:sysoooydyo-` `-//+ooo/.`
                                                     `./sdNMMNmho/-`                                                                `.-/shmNMmh+-`                                         .+ss:` `./hy:` `-yh:`      .+ds.    .+-` .omo.  .+s:` `./hh:`
                                                        `-+hmNMMNNdy+-``                                                        ``-/ohmNNNmds:.                                            .smo`    `+my-  -yh/..```  `+ho.    `/-` .om+` `+ho`    .+my-
                                                           `-+hmNMMMNdhs/-```````........````````                          ``.:/oydNNMNmho:.`                                              .omo.    `/mh:  -ydyoooso:``+ho`    `/-` .om+` .sms`    `:dy:
                                                              `-+ydmNMMMNmhyyhhdddddddddddhhhyyysoo+////:::::::---::::://+oshdNNMNNmdy+:`                                                  `:hy:`   `/do.  -yh:` .+my:`+ho`    ./.  .om+` `/dh:`   `/h+.
                                                                 `.:+ydmNNNNNNNNNNNNNNmmmmmmmmmmmNNNNNNNmmmmmmmdddmmmmmmNNNNNNNmdy+:.`                                                      `:yy/-..:o+.  ./hh/..:odo-.+ds.`:+/:/```:sNs-` `/hy/-..:o+.
                                                                     ``.:/++oooo++//::--.......-:/ymmdmds+++++++++++++++++++++/:.`                                                            .:+o+/-.`  .:ossooo+/:.`-+s+-.:oo:. `/osyso-` `.:+o+/:.`
                                                                                                 .sdddh/`
                                                                                                 +hddds-
                                                                                                `sddddo.
                                                                                                `sdddh+`
                                                                                                `sdddho.
                                                                                                `odddds.
                                                                                                 /ydddy-
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                                                                                                  :ydddh:`
                                                                                                  `/hdddy:
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                                                                                                   `:hdddh+`
                                                                                                    .+dddds-
                                                                                                     .sdddho`
                                                                                                     `/hdddy.
                                                                                                      .ydddh/`
                                                                                                      `ohddho`
                                                                                                      `+hdddo`
                                                                                                      `+hddho`
                                                                                                      `/yhhs:`

*/

#include<bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define rng(a) a.begin(),a.end()
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
using namespace std;
typedef long long ll;


main(){
int n;
cin >> n;
vector<string> e;
vector<string> b;
vector<string> c;
vector<string> d;
for(int i = 0;i<n;i++){
        string a;
        cin >> a;
        if(a[0]=='B' && a[a.size()-1]=='A')d.pb(a);
        else if(a[0]=='B') c.pb(a);
        else if(a[a.size()-1]=='A') b.pb(a);
        else e.pb(a);
}
string ans = "";
int j = 0;
if(b.size()){
    ans += b[0];
    j++;
}
while(d.size()){
    ans += d.back();
    d.pop_back();
}
int i = 0;
if(c.size()){
    ans+=c[0];
    i++;
}
while(j < b.size() && i<c.size()){
    ans += b[j];
    ans += c[i];
    j++;
    i++;
}
while(j<b.size()){
    ans+=b[j];
    j++;
}
while(i<c.size()){
    ans+=c[i];
    i++;
}
while(e.size()){
    ans+=e.back();
    e.pop_back();
}
int q = ans.size();
int ansek = 0;
for(int i = 0;i<q-1;i++){
    if(ans[i]=='A' && ans[i+1]=='B') ansek++;
}
cout << ansek << endl;
}


Measured memory_bytes: 896